I fear you are betting your 100 bucks on a dead horse whose meat is already rotten. The developer was known to have released games before in an unfinished condition and abandoning them immediately, without support. None of them was picked up again by anyone. The distributor is gone, and I think the developer also broke apart meanwhile. The code of TvT has been described to be organised in an unusually complex way, if I got that right, which makes modding it extremely difficult. Interest also is thin, to put it polite. Some enthusiasts will mabye add this or that small cosmetic change, but a complete overhaul is very unlikely, even more so since the copyright also is not invalid but still protected, and will not be abandoned for another couple of years.
Don't hold your breath for TvT, dude, chances are you will run out of air anyway. And for 100 bucks, since you mentioned that number, you can already get SBP (around 90 Euros). And now that is where you get simulation quality and ongoing first-class support, really.
Don't get me wrong, if you spend your money and you like the game, good for you, and this is not to talk you into a depressive mood, but to save you from disappointment. I bet 99:1 that what you hope for simply will not happen.
Everybody else: better think twice before investing your hard-earned money here. Consider that many people both with Vista and XP reported to have been unable to even run the game, both in SP and MP. There have been a very damn lot of complaints.