At present there's no way to only enable certain buffs or to enable/disable buffs on pets/vehicles.
However, you can limit the number of buffs that are displayed with the '/nui maxauras {n}' command where {n} is the max you want shown.
There's also an optional plugin in the "nUI: Unit Frame Layouts" download section which replaces the aura bars with buttons which may be more space friendly for you.
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