As seeing your rank and concern about your expectedness. I am really sorry to say that you cannot take as escrow in signature, bounty, ico or simple trades. Please look the link below provided. There is already many people in forum doing and they have trust from the other people involves in the trade with them. Please shoot a pm to Lauda or Ognasty to teach about that.

https://bitcointalk.org/index.php?topic=855778.0