Rather than deal with keeping track of tx/rx ids in BlooM, I've decided to do away with them entirely. Instead, to "bind" objects together in a transmit/receive fashion, you select the objects you wish to be the receivers, followed by the object you want to transmit/trigger them and then press the b key to bind them. A visual will appear on transmitting/receiving objects to show you how triggering happens. The action that is performed on the receiving object is determined by the Command in the sprite properties. The same can also be done with sectors.
View of the transmitter/receivers:
Sprite setup:
