PTVS build options

I’m trying to port my python build system from Aptana to PVTS. However I can’t figure out how to set up build steps in PTVS : in a c# project (for example) I could add extra operations to the build in the project configuration. Am I missing the equivalent in PTVS? Or is it just not there?

Update: I talked to the guys from PTVS, it’s not possible in PTVS 2.0 . They expect a no-ui, hand-edit-the-project-xml version in 2.1.