tub p-trap vent more than 5'?

***EDIT!***
tub drain is only 4.5' from the drain-vent in wall that will also be used by double vanity sinks
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Trying to decide if i need to add a vent for tub p-trap.

the pictures show the area the tub will go in (left side)
the right side is where the drain is.

i can face the tub with the drain on the left side but venting the 10ft p-trap would be a decent amount of work

so the tub would need to have its drain on the right, which brigs it roughly in the middle of the room.

if a p-trap must be vented at a max of 5', it might work, otherwise i will need to take a vent up to the crawl space above the bathroom, and then join the vent with the current vent (shown in picture) in the crawl space. thoughts, suggestions? would it be a major issue having a p-trap thats vented at 6'?

this may or may not help... the tub will almost never be used... adding it only for lame property value since i removed the tub for a walk in shower (different part of the bathroom)

the drain-vent in the wall will also connect to a double sink vanity later on..

if its not worth the time/effort, i will skip on adding the tub... since it will never be used by me

i might just put in the p-trap, connect to drain and cap the trap., ., leave it for the next homeowner to decide if they want a tub....