The clockwork engines in the 1.5.2 version of Forestry provide essentially unlimited power at the cost of winding them with right-clicking. Is there any way to automate these, maybe with turtles or some other contraption? I can see how this would be very overpowered if mass produced.
no by design, for exactly the reason you cited, (the developer explicitly removed the ability from turtle to be able to right click them I heard)
however an auto-fueled low-tier steam engine row can be powered by a small tree farm easily