I have some experience on the Bombardier CRJ-900 (as well as a few thousand hrs on the L2). Our CRJs do not have auto-throttles, so the approach is 3-axis. The crew have to mind the airspeed.
Do you think this is dangerous?
Throttles = speed, so no I don't. It's dangerous when you are swapping axes (collective = speed) and an engaged mode will fly you into danger. If you haven't got autothrottles it cannot. You now there is no AFCS controlling speed so you are active hands on controlling it. In the case I mention, you have a mode engaged which is controlling what is normally the collective's job and if you put the collective in the wrong place, you reach a point where you lose control. In your CRJ, you leave the throttles at the back and:
a. You get a stall warner - pretty sure there isn't a vortex ring warner!
b. You are used to firewalling the throttle if it goes wrong and hopefully it drags you out. In a helicopter you pull in power, it makes it worse.
So no, in a CRJ, not dangerous.