It would be really cool if you coulds set vault to kic kof certain actions when before and after checkins happen, customised on a per folder/filetype basis
e.g. a user checks in an xml file. An this event is handled and a nant script is run which validates the files xml structure
or
a user checks in a source file. a nant script is run to rebuild the project
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this would be ace. you could scrap CruiseControl and have everything run off project triggers.
Feature request: Commit events
Moderator: SourceGear
Also, check out our plug-in example as an alternative. You will be able to do what you want with this option: Plug-In Example