1. You can't equip to left hand using papyrus. I highly doubt this has been resolved. Mainly here for completeness.

2. User enchanted armor doesn't equip enchantments. I actually started to make a fix for this. I got to the point where I would ask you to equip the item in question. Then I could record the applied effects when you manually equipped the it. Next I linked those effects to the item. Where I am stuck now is applying the effects when the item is equipped. I can't think of a way to dynamically apply effects. I also had a problem where the onequipped event wasn't returning the object reference, so I had to link the effects to the form. Which bring me to my last issue.

3. Form conflict when equipping items. Since you can't use the objectreference to equip an item, two items with the same form can't be differentiated when equipping them via script.

I always look for mods that have figured it out, and try to do what I can to fix it. I don't feel like I am doing everything I can though if I don't ask about these three issues every now and then.

Thanks in advance.

1. No.
2. Not to my knowledge. It's been awhile so I should check to verify. I needed something to do today anyway.
3. This can potentially be overcome by using aliases.

#2 is confirmed as of Skyrim 1.7.7.0.6.

Thanks for confirming them for me.
As for number three, when you say it can be overcome by aliases. Could you elaborate a little do you mean creating aliases of the items. Could I do this via script somehow? I can't predict what items they will hotkey with my mod and they may even be scripted items.

Thanks again.

I've never tried it, but I would imagine you could use a ReferenceAlias in the EquipItem function, and equip the item that the alias is filled with. Perhaps that might not work. Either way, an alias points to (is filled by) only one reference.