Set non-standard starting positions for actuating parts

We should be able to define what position different actuating parts start at. Take pistons as an example, but know this logic would apply to all actuating parts. Currently there is no way for me to tell a piston that its starting position should be 0.5 instead of 1 or 0. This feature, if added, would allow us to change the starting position of said piston in the designer. Note that doing this would also redifine what an input of 0 means to the piston. So if, for example, I have the piston set to a starting position of 0.5 and the input set to Slider 1, then when in simulation, Slider 1 set to 0 would keep the piston at 0.5, Slider 1 set to 1 would extend the Piston to 1, and Slider 1 set to -1 would retract the piston to 0.
Such a feature would extend our design capabilities greatly, allowing for more unique and functional builds.