Adjustable strut rods can correct for tolerences and add a little positive caster. If you overdo it and crank the strut rods in too tight it puts the LCA bushings in a bind. If you need more than a degree or two of positive caster, offset bushings or an aftermarket UCA would be the better solution.

How well do you know your front end guy? I'd talk it over with him. If both of you believe it will help, go for it. Firm Feel and others sell the adjustable rods. There is a fair amount of labor (pull T bars and LCA's) so that would be the time to make sure all other front end parts are up to snuff and change as needed while it is apart.

I used the adjustable rods on mine to correct for tolerance / variation and it really helped keep my LCA's snug with poly bushings and get the alignment where I wanted it.