My experience vs Tau is with Tyranids, Steel Legion, Death Korps, AMTL, and Marines.

I have too many armies.  

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Currently doing a plastic scenery kickstarter

I don't use transports, Mechanization is for the weak.

I will gladly outshoot the Tau any day of the week. Those Fishheads can't stand still and hope to weather the terrible wrath of the Emperor's guns!

Now if the point is to make it easier for them to get supporting fire by moving 10cm why not cut out the middle man and give troops with jetpacks 5-10cm more range on their guns?

It does the same thing, but doesnt need to be mentioned specially or discussed at all, everyone knows what it means and what it implies, no chance of someone going 'wait they get to run away?'

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Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow

It's an established tactical mechanic from 40k.  Interestingly enough, even though both the Eldar jetbikes and the Tau Crisis/Stealth suits use the same mechanic in 40k, they use two different mechanics in E:A.

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"For the Lion and the Emperor!"

None of the mechanics in 40k allow Tau (Or eldar) to retreat when an engagement is declaired... they just (both) get a bit of extra movement in the shooting phase, IIRC.

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Currently doing a plastic scenery kickstarter

The Tau Jetpack and Eldar Jetbike rules both allow them to move their 6" in their Assault Phase even if they aren't Assaulting. It doesn't help them when being charged.

In Epic Eldar Jetbikes don't have their own special rules at all, they use the standard Eldar Hit & Run.

Come to think of it, did anyone think of just giving Jetpacks Hit & Run? Seems if you want to be mobile you should have to Double and eat the -1 to hit like an honest alien.

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Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow

Considering that a game of 40k represents the entire Engage action of E:A, it's a difference without distinction.  *shrug*

I haven't played enough to know if Hit&Run is a better feel for the Jet Pack move than the current rule.

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"For the Lion and the Emperor!"

Considering that a game of 40k represents the entire Engage action of E:A, it's a difference without distinction.  *shrug*

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Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow

Come to think of it, did anyone think of just giving Jetpacks Hit & Run?

I realize Hit & Run won't give them less special rules, but it will give them less new ones that are specifically theirs.

Co-ordinated Fire, this is a no brainer and a small change to the Commander rule, the 15cm instead of 5cm separation is very generous though and either Commander needs to be better of this needs to be worse since this rules is great and Commander is terrible.

Tau Supreme Commander, lso straight forward, no objections

Drones, this should be a universal rule called Expendable or similar since it applies to multiple units.

Markerlights, +1 to hit and no LOF? I call shenanigans on this one, let them use Indirect Fire on marked units. No LOF is broken on any weapon with more than 30cm range, and even then its dubious.

Delfectors, a good rule, I actually like it. Its not another Void Shield and its not complicated.

Robotic Sentry, I don't even know how this works

Support Craft and Jetpacks, BOO!    

I think we can get rid of 4 of those easy, though I'm sure many fishhead fans will fight tooth and nail for them.

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Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow