I've been reading up on the empire boats and realized they had a rather fun throttle with three detents: take-off, full, and normal.
The thottle was tied into the boost control waste gate, carb jets and mixture by an ingenious system of levers and cams, called the 'Claudel-Hobson Three-Stage Boost Control'.
The normal range of the thottle ended at 'normal' (+1 1/4), but beyond that a shift gate let you move the throttle up to 'full' (+2 1/2) and another shift gate then gave you 'take-off' (+3 3/4).
The throttle worked with the two speed prop as follows:
take off: throttle at take-off (+3 3/4) props at 'fine' (fully advanced), flaps 1/3 1st power reduction at 400': throttle at full boost (+2 1/2) prop still at fine, rpm about 2250. flaps up throttle to normal (+1 1/4) props to 'course' (lever fully back)
Normal flying: prop at 'course' boost limited to +1 1/4.