I believe I've only seen one small press that allows this tactic, and I forgot where. It is really not a good idea, unless you are sooooo close to the end that if you do get a request for a partial, you'll be able to nail that sucker by the time a full is requested.
The overall wisdom dictates--finish it. If you need advice or comments on what you have so far, seek out betas or a critique group for this.
Good luck, and welcome to AW.
Tri