It seems that we can transfer .be to Dynadot too, however we need an option to change the owner along with the transfer ('TRADE'). It is a must-have when you purchase .be domains from somebody.
It's possible to trade a domain that is already registered with Dynadot. The steps are the same as those for an EU trade (when the domain is already registered at Dynadot).
I'll add your recommendation for Trade In's to our feature request list.
[This post has been edited by dynadot_staff on Jun 26, 2009 5:51pm.]