Using moshidraw am I able to control the laser power? I have the k40 version with a knob for the current regulation.
You cannot control the laser with Moshidraw. You can only use the knob for manual control. You would need to have the upgraded Moshi board to do so. You are better upgrading to the smoothie and using LaserWeb.
There are power settings in MoshiDraw, but I believe they only work on the rare K40 units with the digital power control/meter, not units with the analog meter and potentiometer knob.