I'm contemplating making planets rotate more quickly. I've sped up rock and ice planets by 10x, and set gas giants to be 3-5x faster still. Note that there is also some random variation in rotation speeds. Check out the following test mod build and tell me what you think:
http://files.spaceempires.net/temp/F...t_Planets2.rar
Note that this doesn't make use of any new planet textures, so you should be good to go if you can run FQM Beta 12 (ie: latest <a href="htp://mm.spaceempires.net/download.php" target="_blank">multimedia pack</a> is installed).