Well, there doesnt have to be a whole range of choices, even just picking options according to what attribute you increased would be good, this would limit it to 3 and then the sub options under that. I am not sure how well going back to look at the other options would work or anything.
well that was a problem the mod i linked had, was there wasn't a lot of variety. if you look at the comments that was the main complaint that plagued it. people want the option to be able to have a say as to what perks they can get no matter what option they choose.
perhaps what should be done is that mod could be expanded upon to where it provides the player with a list of available perks for that level on top of the choices that are left over, similar to what fallout 3 did. No i'm not a big fan of a big message box of perks, but its not like we can create a menu like what we get for the leveling screen, although that would be the ideal way of doing this imo, but since this is Mw and it is a 9+ yr old game, we have to use what we're given. honestly a CE ability like what we are given by birthsigns and the 3 gods would be the best way to have a perk, any upgrades would probably have to be scripted to remove the current level and replace it.
lol idk im just rambling