Hmmmm if you are looking for requests and suggestions, if you could give us the overall theme and the games/features you want to put in your map it would help us out quite a bit.
I guess I have a few suggestions, but it may be biased as it comes from my own preferences in jail maps. With that said:
1) Don't have too many cells where terrorists can hide. I find there is nothing more frustrating and wastes time than looking for terrorists hiding in the cells. Yes, occasionally they pop out and do a lot of damage but for the most part it's annoying imho. Some hiding spots are good but if people have to check 20 cells...ARGH!
2) Have a bunch of features and games that can be easily accessible by an entire team at the beginning.
Hmmm I guess you said requests, I gave tips. I'll stop talking and wait for you to tell us what your map is about ^ ^