hello fellow TBS fans, I am doing what Whiteclaws suggested a few weeks ago and I am building my own game since then. I was part of a modding group that made a client for weewar.com in 2011 and was responsible for the pixelart graphics btw, so I think my interests are very similar to Nasturtium�s taste in strategy games. Since there was comments about the current lack of quality in TBS titles I suggest to check out Panzercorps by Slitherine, it is the best actual title on the market. Also keep an eye out for Xenonauts, a true crowdfunded remake of the old and unmatched XCOM games soon to be released.
regarding whiteclaw�s suggestion of making your own game rather than contributing to someone else�s project, here is my personal experiences so far:
At this point I must say there is always some hassle as one needs to figure out how things are done with the graphical interface in C2, and even if you are a bit familiar with scripting languages (like actionscript in my case) you get stuck on a regular basis. In my case its mostly the order or scope of events, why is there no data passed from somewhere else, why is the order of events working in this case and not in the other, why is the array here not populated yet and somewhere else it is and stuff like that. I spend hours of reading tutorials, forums entries, the manual, still sometimes you cant get further and are dependent on pro help in the forums as the last way out. That is mainly because code for TBS games is more complex than lets say for a jump&run game. The C2 community is very helpfull though, I�d suggest if you encounter problems to isolate the thing not working in a separate capx file, people are usually more willing to help if the code sheet is short and cleansed from things that work and have nothing to do with the problem.
My biggest hindrance usually is that I want too many features in my game and become inpatient when I can�t get past one essential point for days and start making graphics instead of dealing with the joyless bug hunting part. I often lost interest in going on. Surprisingly if one gets back to work, one can figure out & solve the problem sometime in minutes or just try something new and solve it by accident.
I wish the best luck with your efforts, we definitely need some working TBS made by C2!