Doubtful that you will get any decent tomatoes from an inside plant, but
A) Yes they can produce fruit inside.
B) 5 gallon pot is very minimum IMHO.
C) Yes, can be pruned to control growth size.

I just searched this subject and found a few bits of information related to greenhouse grown tomatoes. One article stated that the flowers should be hand pollinated between 11:30 and 2:30, midday, with humidity between 65 and 70% for the best results. Sounds pretty tricky.