But can a .tsg file be made for innext? I can only see an option for the standard joystick.
Look for any .cjm that have been pre-made for the game you want for the innext on that online site. download it. here is one for ghostbusters as an example. Or get the info from the .cjm files that you have.
So load up the carousel game tool and copy and paste into it the input section for the joystick, from the "JU" part onwards, so for ghostbusters this would be in the joy1 as it uses joystick port one. If this does not work then you will have to amend gamecontrollerdb.txt as i mentioned previously.