I'm trying to increase swim speed for Argonians, and have tried two different methods to implement it.

1) I created a new movement type and applied it to 'swim', on the move tab of the Argonian race

2) Went the Constant Effect abilities route (ala the Argonian's water-breathing ability), and created a new magic effect of SpeedMult, which is only active under the condition 'IsSwimming", then I created a constant effect Spell which uses the SpeedMult at a 2.15 magnitute, and finally added the spell under the Argonian race.

I can get the spell to show up in Active Effects when the character is underwater, but the speed never changes.

I am not using any scripting, but don't think either of these methods require it either.

Also, I uploaded a couple of pics showing all my settings to Imgur, but I apparently cannot post links here.

Any help?

Thanks!

When you come out with this, I'd like to use it.

Thanks, but it's looking doubtful so far...

If it's anything like Fallout 3, simply changing SpeedMult isn't enough. You'll need to do something to cause the game to recalculate your speed. Unfortunately the easiest way to do it in Fallout 3 (damaging the player's legs) probably won't work here because there's no locational damage anymore, but you could at least try sheathing/unsheathing your weapon while in the water and seeing if your change takes effect (that was the second easiest way).

You need to specify an impact event for the spell effect. (See: http://www.gamesas.com/topic/1345440-where-to-adjust-actor-speeds/)

Okay, how do you specify an impact event? Though a script?

And just to make sure we're on the same page, I want to re-iterate that I have been able to get the spell to appear and disappear from "Active Effects" as I enter and leave the water, but it just doesn't do anything.

'Impact Data Set' in the Magic Effect editor.
Yes, I know it will show up in the active effects. That is displaying the Name, Description and Menu Display Object for the spell effect. The spell effect itself is working. It's the SpeedMult function which isn't. To make it work, make the player get 'hit' by it with Impact Data. Your next problem will be figuring out what to do when the player repeatedly gets in and out of the water. =p