I think the Ventari tablet should follow you without needing to be constantly commanded in order for it to keep up with your current location in PvP.
The 6th skill should stay the same. So you still command it to pass through allies to heal, with the heal being weaker with the tablet giving a constant heal tick like healing signet to yourself only perhaps.
Or something along these lines.
After trying Ventari, reading some feedback, watching Twitch streams and reading comments made there regarding Ventari, it has been consistantly brought up that the 6th skill feels really impratical during the chaos of Gw2 combat.
P.S My suggestion probably sucks, but you get the point in that the 6th skill is….yeah to pratically use.