Make a macro that has the following in it and name it something:

Code:
/click JambaFTLAssist
/click [bonusbar:5] BonusActionButton1
then close out the macro setup screen and use the following 2 script lines, filling in the KEY and MACRONAME variables with the proper names of course. (yes they need to be in quotes)

/script SetBindingMacro("KEY", "macroname")

/script SaveBindings(GetCurrentBindingSet())
If you use jambadev, it will work to target your leaders target and then will click the first vehicle action button. If you don't use jambadev just change out "JambaFTLAssist with the name of the button your FTL macro exists on in your out of vehicle UI. The buttons are still accessible by name even though they may be hidden.

Follow is a touch trickier since you can't follow target or assist when in a vehicle. What you can do is follow your focus, so you can use something along the lines of:

Code:
/click [mod] JambaFTLAssist
/click [bonusbar:5] BonusActionButton1
/stopmacro [nomod]
/target focus
/click JambaFTLTarget
/focus
/targetlasttarget
/follow focus
/focus target
/cleartarget
With that macro you can have a focus target and store it, should you feel the need to, however you will lose your target on the followers each time. Don't worry I just do that to hide the current target on the followers. No real need for it since there is no PvP in vehicles at this point but no reason not to future proof yourself.

That will click your FTL assist big button (I use the Jamba created button in this case. It will attack using the vehicle button 1 attack and then it will stop on the leader. The followers will continue to process the macro.
They will target their current focus to store it as the last target in a second. Then they will target the leader, focus them, target their last target (the one we stored earlier), follow the leader (the current focus), then focus their stored target, and clear their current target. Sounds really complex but on screen it will look like this.

TL;DR
Try to attack target with vehicle button 1, follow leader, and if they had a focus before all of this happened they will still have that target focused. If you copy paste that macro you will be left with 60 characters for personal modification. I personally have found button 1 to be the best for adding the follow portion to, and I bound these keys to the numberpad keys, with the script. You won't be able to see these macros unless you have a bar addon, but they will work to click the vehicle buttons.

So make 5 macros, like the first one at the top of the post changing the bonusactionbutton# <--number for each one to correspond to a vehicle action. Make 1 macro for bonusactionbutton1 with the follow macro, and bind that to a key that will correspond to vehicle button 1.