As far as I know, no, the PTT is disabled outside of the "Phone" screen. If you are at the home screen, pressing the "P" or the space bar which will put you into the phone screen.
From here you can scroll to a contact that has DC and hit the PTT to start a conversation. The list of contacts shown in that screen can be set for a few different options:
Most Recent
Most Used
Name
Call Log
This actually is pretty useful as it gives you the ability to use this as you see fit.
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