Interrupt events and tweak actions

These mashups can help you to tweak existing interactions. For example: a mashup that launches your custom code when some interaction happens, interrupts the interaction to interact with the user, then proceeds with the original action or cancels it.

Mashups that tweak the "add description" event:

Entity Templates

Mashups that tweak the "change state" / "change custom field value" events:

Custom Field Constraints
Make particular custom field read-only

Mashup that shows warnings about planned events:

Maintenance notification