well, it can be a hassle, because you have to do this for every map you want disabled.

if you want it permanently disabled unless that' box is checked (doing a vice-versa)
open your script editor, find game_map, and at about line 205, you should see this:
CODE
#--------------------------------------------------------------------------
# * Get Whether Dash is Disabled
#--------------------------------------------------------------------------
def disable_dash?
return @map.disable_dashing
end
change it to:
CODE
#--------------------------------------------------------------------------
# * Get Whether Dash is Disabled
#--------------------------------------------------------------------------
def disable_dash?
return !@map.disable_dashing
end
but then that can get confusing, because your check-boxing to ENABLE rather than disable.