Clan War Clan Castle Troop Donating
I'd like to see the troop training time taken out of building troops for CW donations. It can be a long and tedious process to do and will slow down any farming you may be doing. Instead of donating from troops in your existing regular play camps, you could instead just buy the troop from the donating screen and it'd automatically show up in the players CW CC.
For smaller clans, this may not be a big issue as you can get the CCs filled quickly, but in large clans it can take hours, especially if donating witches and dragons, even with a few people donating.