Most mods can be slapped in res/mods and they'll work. As for your concerns for half done content, you're far from the only one who noticed it. Hell, I forgot Braham existed after getting his perk since I just save edit to get it now.
Probably the one in my sig. Classic is just the base game with the mod on top, while the rewrite has several performance improvements at the cost of stability.
I feel you, which is why I'm working on a mod for that. My first attempt involved buffing the Object of Desire perk so it scales with your level.
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The image shows the effects at level 12. While I got it working, I imagine getting a different build of the game to change one perk is overkill, so now I'm trying to figure out how to make this into a peice of jewelry that does the same thing. A ring that looks like a target perhaps?