If enabling of a new feature does not cause problem, then it is good to enable it. Regarding old distros: It is your own decision, how to solve it there: - Aggregate or link needed packages to the OBS repository where blender resides (disable them by default and enable where it is needed). - Use "%if 0%{?suse_version} > 1320" in the spec file and not enable the feature in old distros. (If it is too much work to make it working in old distros.) - Disable build for old distros. (Ugly, don't do it.)