Hasn't she "started channeling" by training damane? I remember somewhere reading the Sul'dam start seeing weaves after awhile...so to me I would think that is them channeling at some point to gain that skill.
She (Tuon) agreed with the Dragons Peace that Rand had her sign before the last battle. She would be breaking that treaty if she did attack them. I dont see her doing something like that and I dont see Mat letting her. It would probably go against some omen she has seen or something.
As to...
Time moves differently at the Bore, so was it 10 minutes, 10 days or more? Wasnt he outside of time while they were each showing the other how things couldbe?
I think Rand won. The DO is sealed away, for however long it will be. If he had destroyed the DO it may have led to one of a million...