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Hi, Happy New Year!
I would leave the rear sway bar off initially and gauge the handling. The rear sway bar should be used to trim out the understeer that the front bar will induce and the amount of trimming will depend on a number of variable factors incl tyre grip, ride height settings, corner weights, driving style etc. The standard rear 944 torsion bar will stiffen the roll in any case and may provide what you are looking for without a sway bar.
As regards adjustable sway bars - yes they are useful. If you think of the sway bar as being able to final tune the basic suspension then adjustable sway bars provide a fine tuning facility to finish the set up. I am not a fan of the 'adjustable' sway bars that consist of a number of holes in the flattened end of the bent sway bar as a) the adjustment is crude, which defeats the object of the fine tuning and b) the holes weaken the bar such that uncontrolled bending can occur when the load is applied and failure is a potential on a poorly maintained bar. The best adjustable bar is a blade adjustable one that can even have the adjustment dialed in on the move as in the best circuit racers or to have a clamp arrangement on a plain round bar both of which are infinitely adjustable within limits.
Clive
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