First thing I want to say is I know some people don't like micro transactions. While others like micro transactions. A micro transaction is when you spend real world money on points that you use for in game stuff like account options or items for the game.
I would like to see some micro transactions although I don't know what you would buy. Perhaps special vanity pets....I love pets. Heck some cosmetic stuff like a dynamic cigar or a cigarette that glows every few seconds and your character puffs out smoke. I don't know what else as long as it doesn't make it to unbalanced for people that don't or can't use micro transactions.
As far as cosmetic items go I hope they add the cigar and cigarette in the game without the need to make it a micro transaction item. I would also like to see some stuff for your character like tattoos and piercings. Some of the tattoos you could get would be faction specific tattoos like a Brotherhood of Steel tattoo. Also faction specific armor so for example; you have leather armor, BoS leather armor, Enclave leather armor, and (insert raider clan name here) leather armor. All the same stats but look different. I'm assuming you can join factions....so if not then disregard what I just said.