Ad 1) With me the only actual bug I have is floating text getting stuck, but after a scroll it dissapears and sometimes when throwing grenades they throw what they have in the other hand too ??
Yes there are a lot of bugs, but my game runs stabile enough to play for several hours in a row with out any crash.
Ad 2) I always play missions in individual TB, because I feel real time isen't tactical enough. Then I would play RA/C&C.
There is also a Squad TB, but I haven't tried it.
Just remember you don't have to be in combat mode all the time.
I only uses real time in random encounters (witch I feel there are to many off) because I just want to get them over with.
Ad 3) place the doctors bag in one of the hands of you healer-guy (properly Sticth) - and either use it, or the doctor skill and click on the person needing healing.
(The blinded person must not be in full health, because then you can't heal him (even his blindness))
Hope this helps a little