Just use any bar addon that adds additional bars.

I use macaroon for example. If you don't want to stop using your own bars, you can set up macaroon to keep showing any other bar and just make one bar in macaroon with a few buttons that will stay the same when in posession of a vehicle.



Personally I have macaroon all the way so when I swap to a vehicle, no bars change. And I just use macro's with my normal skills and vehicle skills in the same macro.

For example (Without any mods, just an example. :P )

/cast Lightning Bolt
/castsequence Revivify, Flame Spike, etc

In the same macro. When not on a vehicle it will LB, when on the Malygos drake it will castsequence the Revivify->Flame Spike->etc, for example.

But like I said, install it and only use it to show one extra bar and bind a key to a button while making a macro in that bar-button et voila, all set.