One can adjust the clutch engagement point to some extent, but it is a bit involved. In highly simplified form, the "coarse" adjustment is taken up at the end of the cable down near the transmission, and the "fine" adjustment is handled by the adjusting screw collar up at the lever. However, it is important to not adjust it so that the clutch doesn't fully engage (wears out fast) or never fully disengages (hard to shift and hard on the transmission). The spring strength is going to be the same, so all one can do is affect to some extent where in the lever travel does the clutch engagement point occur - unless one adapts an EZ clutch mechanism that was an aftermarket add-on in the earlier airheads with an even stiffer clutch than the post 81 models.
The front brake is not very adjustable, though some may have come up with a plan of attack on that.
I have never tried to adjust these things on the R65 as my fingers/hands are long enough, so I am sorry that I am not much help.