Exactly - collective pitch is term used for (real) heli's as throttle equivalent. Technically, Heli's wing is spinning at constant RPM no matter if he's flying or staying on ground - only the spin's angle changes, thus creating more or less drag. Of course, it also require more power from engines to maintain constant RPM.

In simple quadropter models, You're probably not changing pitch of spin's wings at all, but only its RPM, so You're right, it's purely throttle.
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Thanks again for such awesome project. i think that lack of multi-touch isn't any problem - as You've said, accelerometer may be used for roll, pitch and yaw, while on-screen slider for throttle. It could work on N900 the same way.

I'm really eagerly waiting for results, despite not having any airframe to test right now

/Estel