I thought this function must be something invented by goflight......
I'm using bill grabowski's ERJ 145 Panel and rather than using the mouse to control engine startup through the excellent panel I was using the goflight run/cutoff on one button and the engine starter on another (copied for each engine) which worked fine.
Through FSUIPC I've got the engine start button configured and have now allocated the mixture lean/rich for fuel as you suggested. Unfortunately it still doesn't solve it as when invoking the starter it still just spins up the engine to 25% n1 but it doesn't fire. The goflight eng_1_run_cuttoff obviously does more than just enabling the fuel on/off. I've had a look around the 2004 help re finding help re jet engine startup but I'll investigate further.
If you have any further thoughts let me know in the meantime I'll have a feret around myself. Great products you've developed it's really enjoyable using GFdisplay, FSUIPC and WideFS to reconfig my goflight modules to run remotely (I have 9 in total!).
regards
John.