Why don't they simply give me a config flag to change the behaviour? I understand what they are trying to do but it annoys me to have to use non-stable releases just so that I can use a couple of useful extensions not available from the store.
I doubt it violates any T&C but I could be wrong.
When/If this affects me, it will be an entertaining challenge to create a crack which disables the "allowed to install?" instruction. Seems quite simple.