When you try to take a perk and you already have one, you'll get a message saying you can't have more than one. It seems like this would be a good spot to tell the player which perk they chose, because that information doesn't seem to exist anywhere else. If you've been away from the character for a while, a reminder couldn't hurt.
Including this information on EFUSL wouldn't be a bad thing either.
As far as I understand it the EFUSL stuff is not doable unless the perk system is recreated from the ground up.
No, its pretty easy to do if someone with knowledge of efusl speaks with me.