Single metabox on Reciprocal Relationship

Hi Ahn,

Until now, I have been using this plugin to relate an object in post type A with an object in post type B. This works great b/c the plugin creates a to and from metabox on each post type edit screen. I am now being ask if we can have a reciprocal relationship between two objects in the same post type. From the initial testing and reading the docs, both the to and from meta are being created. is there any way or do you have an idea of how to get it down to a single metabox when performing this type of relationship. I would be willing to submit a PR on github if we can talk through how this could be accomplished.

My initial thought was to add a flag in the metabox registration like reciprocal => true and then that disables the default metabox output. Then you can insert the single metabox which is a combination of the two and from objects mashed together somehow. Does that sound like a good approach? What do you think? This is a must have for the platform I am building btw. Really appreciate your time.