Status: More thorough inspection is scheduled, most likely for next week.
We’ll also start to work on a new stack which will have Visual Studio for Mac instead of Xamarin Studio. Related discussion: Will Xamarin 15.2.2 roll out this weekend, and will it fix SDK-style csproj?
In the meantime you can use a Script step and call any tool any way you like, if something’s not supported by the provided steps, or fork/edit our step the way you want it (PRs are also welcome, but it’s also possible to just use your own fork, with the git:: style step ref http://devcenter.bitrise.io/bitrise-cli/steps/#special-step-sources).
If you have any questions just let us know!