Not sure how he implemented this, and too lazy to look it up, but it may not be super-easy. The "Fire Torpedoes" command fires both torpedoes and mines, I believe, and so does the fire all. You would probably need to bind each weapons seperately, and than you might need more than one row for your abilities.
Star Trek Online Advancement: You start with lowbie gear, you end with Lobi gear.
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Just make a separate new row for keybinds, and put mines on it.
WhateverButton "$$+trayExecBytray 4 1"
Where 4 is current number of column you want to assign, and 1 is number of row in that column form 0-9
Edi: here are couple of examples for you:
m "$$+trayExecBytray 4 0"
key m triggers column 4, row 0
Rbutton "$$+trayExecBytray 7 0$$+trayexecbytray 7 1"
right mouse button triggers two columns, 1 press on mouse triggers column 7 row 0, second press on mouse triggers column 7 row 1
Wheelplus "GenSendMessage HUD_Root FireAll$$+trayExecBytray 6 5"
Scrolling mouse wheel up fires all weapons and torp, mines a triggers column 6 row 5