I have a few suggestions which I know other old guys were having issues with. Many of these issues maybe due to the beta aspect of the game at this point, in which case please ignore, but otherwise here goes...

Text is too small in some areas of the screen.

I see from other posts some people were also having issues with the dark regions of interior scenes. The consensus was this was by design. While we did try turning up the screen brightness to alleviate this issue somewhat, it caused other problems.
I really like the idea of a flashlight. (Money making idea, charge a couple of bucks for a flashlight). Plus it will be fun to be called "Grampa" for having a flashlight!

The detail of the individual piece settings is interesting, but since I play on a console it is a major pain in the butt to access and change. Would it be possible to have some sort of access to my character on my computer so I could edit loadouts etc.. The console is great to sit back and kill something, but typing and configuring is no fun. I know that tweaking will be necessary during play, but if I could do major edits and comparisons to my characters on the PC and then play them on the console, that would be awesome!
People like MarcoStyles and other PC player have a distinct advantage in the area of editing and comparing and it would be nice it we could participate at the same level in that regard.
Another thought was to allow access to the character stats and settings on your mobile device while you play.

Is it just me or are the characters running slower in TD2? How about a Segway or power wheelchair for us old geezers. Even a kick scooter would be cool. Maybe there could be a community effort on the streets of DC to provide free scooters! Think of the crashes and pure excitement of killing some dude on a scooter! Talk about road rage!

This is not an exhaustive list and no doubt others will also want express their 2 cents.
Chow for now!