FYI,
I have myself no idea on when v0.3 will come out as I am currently facing 2 major problems. One is my constantly crashing OS, the other one is finding a way to make wheels without using custom modules in order to make my pack mobile-friendly (Part creation toolkit recently added support for Android builds, tho its not implemented into mobile game itself yet). One of the ways seems to be making wheels drain power always when on, but I have genuinely no idea on whether it is a good option and if it is even possible without said custom modules.
WheelModule works with the attached CS file in the zip.
How to do the power on/off... (although I don't have the code for what happens when you run out of electricity, i'm trying to figure that one out myself, basically when electricity = 0 you want to toggle "wheel_on" to off... but how... that is the question).
Okay here is how you regulate power in an object on/off.
1. Create 3 Variables, my example I used Flow_Rate/Deploy_State/Deploy_Target
2. Create an Empty Object, I called mine "Flow Control" 2. Put your "FlowModule in that empty game object.
3. Make a Move Module on your main control or asset that will be clicked (in your case it would be the wheel, for me its the Tank) - use variable "Flow_Rate" and set it to what ever you want.
4. In the MoveModule set up an "Active" curve and set it to your empty object (in my case its "Flow Control") use Deploy_State (0) and Deploy_Target (1) and time 0.25seconds (move hates "Zero")
5. On Part Script add a call to Toggle the MoveModule (Toggle NOT activate as that only works one and stays on forever). Tada!
Now when that part is clicked it toggles your resource drop. Of course this is just on/off but applying that technique and linking variables etc you can get really fancy things happening.
Example is in the Vent_Tank.zip
Hopefully these help