< Another way to define a mirror plane would be by drawing a line that defined the plane's perpendicular
hehe that is that I made also here for a "rotation" :D
http://moi3d.com/forum/index.php?webtag=MOI&msg=156.4

< I kind of hestitate to add a bunch of things in when some of them might not be used very often and can be done pretty easily with some combination of existing tools... It can tend to be difficult to remove things once they are added.
sure ;)