Is it possible under version 1.2.5, or will it be under a later version, to prevent the system being considered idle when the phone is close enough? I'm having to turn off features I would really rather keep on, so that they come into play when I pause blueproximity, simply to stop my screen going off.
The proximity command (under Locking tab) should be doing this for you, as I understand.
My guess is that you need to change the proximity command. The default command "gnome-screensaver-command -p" is deprecated and gnome recommends using the new "inhibit" command:
That should cause the screensaver to remain "inhibited" while you're in proximity.
after further testing, it appears that the "poke" and "inhibit" commands both cause gnome-screensaver to remain disabled. See bug #542938 at http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;bug=542938