Getting slightly off-topic, but that's not always the case with IGH. If the cable housing is attached to the frame with QR tabs, you can often get enough slack to remove the wheel by simply de-attaching (is that even a word?) the housing from the first 2-3 tabs.

Regarding frames, don't all belt driven bikes come with a break in drive side rear triangle, otherwise you wouldn't be able to remove or install the belt?

--J