short term is a no for shutter count. I can't find the property for it yet. Feel free to help me hunt it down

But the fact that canon can check the shutter count at its service centers tells me that there is a property recording it somewhere.
Made some progress today: ML is now detecting half press shutter finally

I had to hijack a state object (EMState) to see when the shutter was pressed. This is because for whatever reason, only an event for halfshutter unpress is sent by the GUI task. So I had to improvise.
Next I need to find focus confirmation, that will make Trap Focus work.
For HDR / bulb timer I need to find a way to trigger full press of the shutter (PROP_REMOTE_SW2 isn't in the 5dc).
For custom AF patterns I need to find the property for the focus points.
Progressing nicely
