As a pre-ascension player, i find buying buildings still bothersome. How about you change it. abandoning "Max." and giving the building pane a Ctrl+Click abilitiy to buy the maxium uf the units selected (buy as much 1, 10, 100, 1000 as you can afford)?
Hi leifczerny, the boomerang effect is a cool idea, I might add it in a patch soon.