Hi hbondy,
Ok.. I have just added that feature on the devel branch. Specify "group=something" to the button definition and it will create a "something" section in the display just below the regular extension list. I will try now to continue working on trunk details (I will leave actions on trunk lines for a future release as it will take quite some time to do). And finally I will also try to tackle parking, but I believe it will have to wait a little longer as it is not that simple..
Regards,
