I've also gotten complaints about how unexplored territory is shown. I've settled on this style, which has the underlying color, with a stippling of gray12 drawn on top.
Most of the development has been in order checking. I now check the first word of all commands to make sure they are real. I also check the targets of GIVE commands, and some inventory checking (making sure you don't give what you don't have). I also check that units doing STUDY have enough silver (based on the skill table - the first turn of studying a new skill will not be checked).
I'm also showing the last seen foreign units in hexes without the current data. I was having trouble remembering what monsters were where, and where I had seen enemy units.
