That would probably get annoying, especially with a hotter cam that is going to have a more lopey idle than a stockish cam. In fact, I know it's annoying, since my 242 is currently requiring that I hold the throttle open, due to a non-functional constant idle system. Also, Volvo does have a warning saying not to "race" a turbo engine when cold, even though the constant idle air valve does that initial blast to 2000 rpm before it settles down to idle.
Personally, what I'd do, if you don't want a constant idle air valve, would be to run an auxiliary air valve from a non-constant idle B21F. Has a bimetal spring in it that causes the disc inside of it to open and close, depending on temperature. Requires 12 volts power and ground. Set idle to whatever makes the car run smooth enough when warm, then, when the engine's cold, crack open the throttle a little before starting, then release as soon as it fires. Engine will run around 1500ish rpm until the valve gets warm enough to close itself.