In prior Fallouts, there were NPCs who desperately wanted certain items, so I went about rounding them up. I'm hoping that the same will happen here, either through a quest I haven't yet run into or in a DLC. Thus, I'm holding on to:
~ Burnt books/textbooks/magazines/comics
~ Teddy Bears
~ Jangles
~ Subway Tokens
~ Nuka Colas (all varieties)
~ Dogtags
As far as behavioral quirks, I have a few:
~ All mannequins must be horizontal. My character is on a mission to topple them over whenever she finds them.
~ Just like poster Agrona above, an area is not CLEARED until I say it's clear.
~ I don't unlock locks with computers unless I have no other alternative. Why forego the lockpicking experience?
~ I'm currently working on a full billiards set. I have the cues, a few racks and most of the balls. Now I'm missing only the 11-ball (found the 7-ball last night!). I wish I could actually play once I complete the set.
Speaking of in-game games, I miss playing cards, as we could in New Vegas. I found room with pinball and skeeball machines -- wish we could actually play them. I also wish I could set up (and use) my own bowling alley or use the basketball and hoops. DLC perhaps?