This is a really good/smart idea! Definitely an agree from me!Ok so some people might hate this, but what if custom cape visibility was a V.I.P. level / partner feature.
1. This would encourage users to get V.I.P. levels or become a partner
2. It somewhat removes the usage of inappropriate cape designs because people who have become partners or spent money on CubeCraft typically don't want to get banned, meaning that they probably won't put inappropriate designs on capes.