Hi
From my experiences, the drag in the cables, although they shouldn't have any effect on the handbrake, more than likely will affect them. The adjusters on mine have lost the self adjusting element and refusing to pay the rrp, I Just adjust them in advance of the mot, or whenever the pedals travels a long way. Any sudden change topical feel could be any number of things, either a slipped adjuster, or other brake element. I would check the car over before using it again, as brakes are quite useful!
As for your other questions I'm not sure what you mean, but if you could clarify, I'd be happy to help you.
Cheers
Jamesatthews