What does minimum delay time mean?
0.0150
if you're serious about that, do you really need it to go that fast? And for how long were you going to keep it at that speed?
1. It has to process input events from he player constantly so it has to react asap.
2. Forever? 

To really get a sense of what your situation is, you'd need to explain a bit more about what you are using the quest scripts for.
Well, I could post it for a start:
scn ZRMainScriptshort initshort zoomTrap; 1 = no weapon; 2 = holstered weapon; 3 = weapon without scope; 4 = weapon with scopeshort modeshort lastModeshort zoomingshort reloadingshort holdingBreathfloat timershort holdTimeref weaponref lastWeaponfloat weaponFOVfloat weaponRange; Keysshort zoomKeyshort internalZoomKeyshort holdBreathKey;----------------------------------------------------------------------------------------------------------------------------------------------; Init blockBegin GameModeif init == 0	set init to 1	set zoomKey to 257		; left mouse button	set internalZoomKey to 38; L key	set holdBreathKey to 56	; left shift keyendifEnd;----------------------------------------------------------------------------------------------------------------------------------------------; Mode setting blockBegin GameModeset weapon to player.getEquippedObject 5if weapon == 0	set mode to 1elseif player.isWeaponOut == 0	set mode to 2elseif getWeaponHasScope weapon == 0	set mode to 3else	set mode to 4endifif lastMode != mode || weapon != lastWeapon; Remove zoom effect for scopes	if mode == 1 || mode == 2 || mode == 3		con_SetGameSetting "fIronSightsFOVTimeChange", "0.25"	else		con_SetGameSetting "fIronSightsFOVTimeChange", "0"		set weaponFOV to getWeaponSightFOV weapon		set weaponRange to getWeaponMaxRange weapon	; TODO: Zoom		if weaponFOV <= 25 && weaponRange >= 2000			PrintToConsole "3 StepZoom" 		elseif weaponFOV <= 35 && weaponRange >= 1000			PrintToConsole "2 StepZoom"		elseif weaponFOV <= 40			PrintToConsole "1 StepZoom"		endif	endif; Reset everything when mode changed while zooming	if zooming == 1		releaseKey internalZoomKey		set zoomTrap to 0		set zooming to 0	endifendifset lastMode to modeset lastWeapon to weaponEnd;----------------------------------------------------------------------------------------------------------------------------------------------; Hold breath blockBegin GameMode; Regenerate/Keep holdingif holdTime > 0	if timer > 0		set timer to timer - getSecondsPassed	else		set timer to 1	; Regenerate		if holdingBreath == 0			if holdTime == 1				PrintToConsole "1.0"				con_SetGameSetting "fGunWobbleMultScope", "1.0"			elseif holdTime == 2				PrintToConsole "2.0"				con_SetGameSetting "fGunWobbleMultScope", "2.0"			elseif holdTime >= 3				PrintToConsole "3.0"				con_SetGameSetting "fGunWobbleMultScope", "3.0"			elseif holdTime >= 4				PrintToConsole "4.0"				con_SetGameSetting "fGunWobbleMultScope", "4.0"			endif			set holdTime to holdTime - 1	; Keep Holding		else			if holdTime >= 4				set holdingBreath to 0				PrintToConsole "4.0"				con_SetGameSetting "fGunWobbleMultScope", "4.0"				playSound ZRReleaseBreathLong			else				set timer to 1				set holdTime to holdTime + 1				playSound ZRHeartBeat			endif		endif	endifendif; Scoped weapon, zooming, hold breath key pressed and not firing a weaponif mode == 4 && zooming == 1 && isKeyPressed holdBreathKey == 1 && player.getAnimAction != 2			if holdingBreath == 0		if holdTime == 0			set holdingBreath to 1			PrintToConsole "0.33"			con_SetGameSetting "fGunWobbleMultScope", "0.33"			set timer to 1			set holdTime to 1			playSound ZRHoldBreath		endif	endif; No scoped weapon or not zooming or not pressing hold breath key or firing a weaponelse	if holdingBreath == 1		set holdingBreath to 0					if holdTime >= 3			PrintToConsole "3.0"			con_SetGameSetting "fGunWobbleMultScope", "3.0"			playSound ZRReleaseBreathMedium		else			PrintToConsole "2.0"			con_SetGameSetting "fGunWobbleMultScope", "2.0"			playSound ZRReleaseBreathShort		endif	endifendifEnd;----------------------------------------------------------------------------------------------------------------------------------------------; Main blockBegin GameMode;---------------------------------------------------------------; Default  zooming behaviourif mode == 1 || mode == 2 || mode == 3	if isKeyPressed zoomKey == 1		if zoomTrap == 0			holdKey internalZoomKey			set zooming to 1			set zoomTrap to 1		endif	else		if zoomTrap == 1			releaseKey internalZoomKey			set zooming to 0			set zoomTrap to 0		endif	endif	return;---------------------------------------------------------------; Toggle zoomingelseif mode == 4; Handle reload	if player.getAnimAction == 9		if zooming == 1 && reloading == 0			releaseKey 38			set zooming to 0			set reloading to 1		endif	else		if reloading == 1			holdKey 38			set zooming to 1			set reloading to 0			return		endif	endif			if isKeyPressed zoomKey == 0		set zoomTrap to 0		return	endif	if zoomTrap == 1		return	endif	set zoomTrap to 1; Zoom in	if zooming== 0					holdKey 38		set zooming to 1; Zoom out	else		releaseKey 38		set zooming to 0	endif	returnendifEnd
What it does, in a nutshell:
- Make the zoom for scoped weapons toggleable and instant
- Add the ability to hold your breath while zooming.