Is there a way to configure a maximum build rate



I just got a warning about using too many builds with my OS X plan. I would be useful to be able to configure the circle.yaml to say: ‘Don’t build more often than once a day’.
Otherwise, I’d have to turn off automatic builds and use a different manually configured branch. I guess this is a way, but it’s more cumbersome and most likely problematic.
Also is there a way to configure OS X versus linux builds for a single repository so I can do some builds on linux only (like using codepush to update things) and other ones for MacOS to build iOS and android apps. For example one branch running OS X and another branch using linux.