No need to clear space in army camps to donate troops.
How many times have you done this??:
1) Have a full army camp
2) a troop donation request is made for a troop you didn't build.
3) You build it.
4) You have to delete N spots in your army camp in order to donate it.
- remove troops or attack
5) donate the troop
6) rebuild the army you displaced.
I think you should be able to build the troop and donate it without having to clear the spot in the army camp. Wouldn't really change game play/economics/build time. Just a convenience for the big donators out there. The donation panel should have available all the troops from your army camp + whatever is finished building in the barracks. If a troop can go from finished to your army camp why can't he go from finished to your clan mates army camp?
Sorry if this has been suggested before. I searched but didn't see it on the features list or a previous thread.