I use a naga and use shift and control to access tray bars one and two. I thought about the control and shift space things... found it easier just to put the extra torps on a key. Good idea though likely works for most people. The naga makes it great for skills I have 2 copies of though. I put them on the same spot on 2 diffrent bars... so
Engi Team 1 Tray 1 slot 8
Engi Team 1 Tray 2 slot 8
/bind 8 "+Trayexec 0 7 $$ +trayexec 1 7"
Sorry though thats kinda off topic lol