Hi Ed - I was able to cook up a script to automate the "blend end cap" method for you.

The way it works is you should copy the attached file to the \commands sub-folder inside of MoI's main installation folder (or on Mac, right-click the .app and choose "show package contents" and inside there go to drive_c/moi/commands). That will make a new command called BlendCap available, put in a shortcut key with BlendCap for the command name to trigger it.

Before running it, select one closed, unjoined edge curve. Then when you run the command, that edge will get split into 2 pieces at the edge's midpoint, and the 2 resulting pieces will be selected and then blend will launch.

Hope that is what you were thinking of.

- Michael