Art,
I still get itchyness like I said before... I've been on minoxidil since December 2003, I would say the itching got dramatically less by month 3-4. I'll say it again, it still itches, just not to the point it did before. I don't use nizoral or T-gel, cuz I feel like it makes my hair feel like crap,(dry to oily, never in between) But there's a lot of people on this board that say, either of those products work great for them.
I don't think scratching it is gonna really effect the results of the minoxidil. It's ok to scratch your scalp(if it itches, sh*t you gotta scratch it.) It's all in the sake of keeping your scalp less irritated, cuz if you do scratch hard and do it persistently, the skin breaks up, and that doesn't help. Just don't go buck wild stratching your scalp is all i'm saying. If you need to scratch it, scratch it soft and try not to dig your nails into your scalp either when you scratch.