I play Tanki Online... And they have the awsome feature of micro-upgrades. I think they should have micro upgrades available in clash of clans.
Some features for micro upgrades I think would be great:
1. After fully micro upgrading your troop you get a free upgrade to the next troop lvl (when you get your next lab lvl) but to keep it balanced wait time should still be the same.
2. Micro upgrades should have very short wait times that gradually get larger. for example, Wizard lvl 3 takes 1 hr to micro upgrade once.
Micro upgrades would work great on hero's so if it would be to much to micro upgrade your troops, it would be amazing for hero's.

