Thanks for the idea! My problem is that since I'm just one guy working on this software, all time spent in community management is time not spent in actual development, so I need to be careful which communities to set up and keep track of. Right now I've got this place here, Facebook and the trainsim.com thread (+ my own website). That's not too much right now but there will possibly be other ones as well, like Steam forums, in the future.