Hello there, after trying to get my mouse to preform in a similar fashion to the way it did while playing warcraft I found that there appears to be a rather noticeable bug in that the available key bindings for action bars is reduced by a third, doubling up the key binds for the main bar in the process.
To attempt to illustrate I'll list the effected key bindings using the default settings:
Tray Slot 1: 1 = Alt Tray Slot 1: Alt+1
Tray Slot 2: 2 = Alt Tray Slot 2: Alt+2
Tray Slot 3: 3 = Alt Tray Slot 3: Alt+3
Tray Slot 4: 4 = Alt Tray Slot 4: Alt+4
Tray Slot 5: 5 = Alt Tray Slot 5: Alt+5
Tray Slot 6: 6 = Alt Tray Slot 6: Alt+6
Tray Slot 7: 7 = Alt Tray Slot 7: Alt+7
Tray Slot 8: 8 = Alt Tray Slot 8: Alt+8
Tray Slot 9: 9 = Alt Tray Slot 9: Alt+9
Tray Slot 10: 0 = Alt Tray Slot 10: Alt+0
In the example above, "Tray Slot(s)" 1 through 10 behave normally while "Alt Tray Slot(s)" 1 through 10 mimic the aforementioned commands, as a result, the main tray commands and the "Alt2 Tray Slot(s)" are the only two trays available for key bindings while using the Naga tray.