Not sure what you mean by developer friendly. These forums are intended to support the themes, plug-ins and core WP which are downloaded from this site. Forum policy is that commercial themes are not supported here — as they are generally supported by the vendor/developer (or should be) and because they are not freely available for testing/use by people here who are helping out.
With non-GPL themes, that’s also a question of the open source values and philosophy WP is founded upon — I’d certainly avoid any themes that are in violation.