Tower Defense Rotating game mode

I have found that there are rotating games which are not played very often and would suggest to limit those to only a few days or remove them completely and leave the ones that are played more to longer periods. There must be stats on the ones that are most enjoyed so please get rid of the ones that least played. I think a good game mode to develop would be a tower defense mode with new map. If you released a map editor or game developer mode I am sure the community would develop better modes than what we currently have.