Insane Like Train is rarely played on. So these suggestions are for Pro Like Chro.
1) One medic limit. When there is 2 medics on a team, there is a 60% chance that the opposing team has NO medics, and if they do have medics, a 90% chance that the opposing team has only 1 medic. Not to mention that I think it really screws up the logistics of the game.
2) Custom maps like cp_waste, cp_yukon, cp_follower, etc. Insane Like Train has them, but nobody plays on that one. It's as simple as that, we need these kinds of maps to be tested on a server that people play on.
I can't believe there are only, what, 4 maps on pro like chro? Granary, badlands, well, and gravelpit.
So...please consider these suggestions - they're important!