>> "Does I've to define 1.2, 1.3 too?"
Nope, not unless you want to.
>> "What about switching from 1.5 to 2.0 ? I don't see any way to come up to version 2."
Just name it version 2.0 and wyBuild will happily update your app.
>> "What I'm also missing is a way to delete old files out of the application directoryare you supporting that."
Yep: