1. on the backend server get into mysql - mysql -u <user name such as mythtv> -p<password>
2. type -- use mythconverg
3. type -- update jumppoints set keylist="Alt+G" where destination like "%MythGallery%" and hostname like "%<yourminimythhostname such as mf1>%";
4. Next boot will make Alt-G operational at the frontend machine
Would be better if we had Edit key in the setup menu.