New utilities for the remote radio system would be a great addition to the game. It would bring a new use to the enviroment and the itens that nobody uses.
Some ideas for them:
1-Handheld Transceivers can be turned into improvised detonators using a screwdriver, but would have a chance of ruining them or failing to detonate (some kind of nerf)
2-Field Transceivers can be deployed on the ground (such as a barrel or a tent), and you can hear it from 5 meters away, so players can deploy them at their bases.
3-Add a new event (plane crash, UN supply drop as example) that makes a stress signal in one of the radio frequencies, for the Handheld Transceivers only a 3km away event would de sent, and for the Field Transceiver a 8km radius.
4-A Handheld Transceiver can be atached to a tripwire, so when triggered makes an awfull static sound to the close survivor and in the radio frequency its set on (for 5s).
5-Add a bunch of new frequencies, so survivors can comunicate with more precision.
6-Reduce the Handheld Transceivers weight drom 1kg to 0.5kg for easier carry.