Although legally you may not be in a great position, there is always something you can do. You must take into consideration the registrars position. They probably have thousands of names and help on to yours because they either think it has value or have intentions of developing it. As you have suggested they have no intention of developing we must assume they feel it has value. If you made them aware that you were a previous owner of this domain name, they may think that you asked them to sell in order to get a price from them that you could use against them in a legal battle. This is what I suggest:
Contact the registrar from another email address and do not give them any indication that you have had any previous dealings with them. You may also have a have a mediator do this for you. Do not mention price. Simply find out if they would consider selling the name should the right buyer come along. Once you have an indication that they may sell under the right circumstances, find out what those circumstances are and create them.
If you need help with this process you may contact me at
[email protected].
Thank you.