No. We don't want to have the default Load Bricks window crowded with crap, and there's enough default saves anyways. The default saves are really just to help you figure out how to build non-noobishly, and in a way that people will be impressed.
You know the Maze save from Slate? That was built when Blockheads' arms and legs were still attached to their bodies. No default saves were really added aftwerward, really.
If you want to get your save default, you're going to have to get Badspot to join your server, and HELP you BUILD the thing. Or you should get really famous blockland-wise and ask Badspot to have your save made default.
Bottom line is, no.