Disputes:
Although I hope I will not encounter such cases, disputes may appear. In such cases, I will ask both parties to explain as detailed as possible what happened, from their own perspective. I hope that such incidents will be mediated in a pleasant manner and I may appeal at other forum users, with high reputation, for their opinion.
This is the tricky part, and I think many of the existing "established" escrow providers on Bitcointalk fail in this part. Have you read
Best practices for Bitcointalk escrow providers? If not, I encourage you to do so.
Before accepting any escrow deal, ask yourself if there's any possibility where neither party can prove what happened. If that's the case, I wouldn't accept it.