Feature Request: Clan War Availability - Upgrading Heroes

I am sure someone has requested this feature before.

Upgrading heroes are currently not available in clan war, but we really need them to take out defensive heroes with major attacking strategy such as Hound/Balloon/Minion and Golem/Hogs. The defensive heroes are really ruining the attack if we don't take them out, but with limited army camp, we need heroes to do the job. Othereise, it is almost impossible to clear same level target.

SuperCell, please consider this feature.

Thanks