Its not a question of "how much descent am I allowed".
If you do stall then you are coming down, period. Possibly in an uncontrolled fashion, if things REALLY go wrong. At least if you put the nose down its a controlled descent.
If you have been placed in a portion of the flight envelope where stall is no longer avoidable then you have an emergency. Anything you can do to escape that situation is a valid course of action, IMO.
Yes you may deviate into causing a conflict - so tell people what you're doing, if you can. TCAS will help keep people out of your way, with any luck. But to put yourself into a situation where you lose control of the aircraft out of a desire to maintain an arbitrary altitude is not the safest course.
For info, this is an extract from an All Operators Message we issued following the Jefferson City CRJ crash (it's referred to in section 'M' of the
Operations/Human Performance Group Chairman's Factual Report on that accident.
Do not wait for the onset of continuous ignition or stick shaker before attempting a descent from an altitude where continued operation is not possible. Descend immediately.
In the event that a stick shaker / approach to stall occurs, the crew should expect that a deliberate loss of altitude will likely be required in order to restore the aircraft to a normal energy state and to prevent an aerodynamic stall and possible departure from controlled flight.
I don't think there's anything at all special about the CRJ in this regard; it's basic physics at work.