troop bank

Not all clashers are on at the same time. Especially at upper levels where upgrades can take 1-2 weeks. This limits anything to actually do in game. I think the game would benefit from a troop bank. Members can put troops in available to other members when they need cc troops. Say 350 troop spaces per member. They can be tiered so only certain members can get certain troops. Say elder+ etc to make sure hoppers don't kill the bank. The donating player's troops would stay available as long as they are in the clan. If they leave their troops disappear from the bank. This way clan members with long builds can help each other when not online to a limited degree. It will also help keep activity of those who are already online.

Ya what if it is similar to requesting cc troops and u can only do it every so often

This is why you need to make sure you've found an active clan, preferably of people around the world, to keep your clan castle full. :)