Actually so far I never noticed any difference in shifting I will take my bike out the shed this afternoon and try to discover whether what you're thinking it is is noticably working.
Yes, it was to increase the amount of effort it required to shift. Don't know if this was to prevent accidently changes that everyone seemed to complain about with gripshift systems when climbng. Not something i ever had a problem with. :roll:
When I said 'supposed to increase shift tension', what I should have said was 'they said it's supposed to increase shift tension', I never noticed any difference either!