Hello @Rxman and welcome to the forum, lot’s of nice folks here if you ask me.
As to your first question I don’t think there is a place to enter your machine in gSender. Perhaps you are thinking of the one in VCarve?
As to the second I know people use the bit setter with gSender. @NeilFerreri has developed macros and a VCarve post processor for using the bit setter, I think he might have a Shapeoko as well but don’t quote me on it. His Vectric pp’s can be found here.. Searching this forum for ‘bitsetter macros’ yields 12 results. The first result is here and there are some macros to download but I don’t know if they are the latest he has or not.
Hopefully Neil will see this and point you in the right direction if I have not. In any case don’t anchor your boat with your bitsetter just yet!