I havent used vertex, maybe contact lenses would help
r_stencilbits 8
cg_shadows 2 (cant remember if its the right syntax)
.. then up the gamma and it woks quite nice for people who like brightlight!
erm.. technical issues... well, not really, but some people are getting confused between delag correction because they haven't figured out that other people get better... they remain the same if they have superior network. The correction issue is with the models. Compare against the default team model and the difference is very noticable. People will probably start assuming it's related to delag and maxpackets so hopefully that will end their attempts at changing config settings in vain

That is assuming they dont have any other problem such as ridiculous graphics settings. Maybe they dont realise the difference between performance and optimum detail. Worth noting as quite often assumptions will just end up in pointless discussion.