The question is that whether the MR3040 custom firmware can access and control the 7D remotely or not. The 7D having a USB 3.0 port now instead of the mini USB 2.0 port, going to the MR3040 may not work, either due to USB, or new command structures in the 7D for live view, video, settings, etc. A new camera and its utilizing of USB3.0 may complicate the current implementation of DSLRController and the MR3040 firmware.
What each of your motherboards can or cannot do or what your prior devices manufactured by a large company garnering global market share has no bearing in this situation, because this is a 3rd party customized solution involving hacked hardware. You cannot make any assumptions here on either point. 