I would definitely support making the mini map just a bit smaller. It seems that I for one do click the minimap occasionally but I always click the very upper right tip because I overshoot the mouse just by a little bit (I think in dota the mini map is a bit smaller?)
1. Make it an option to disable minimap Right-Clicks
2. Even when disabled you can still press M+LeftClick or A+LeftClick
on minimap to order move or attack-move.