pantheis/ChargingBench — pull request #38 by Tallinu (2012-10-28 12:38:18+00:00)
Title: Have a look at the GUIs in these gimp files.

My preference is for the first one. The second is like what you suggested, except with altered arrows for improved clarity. Another option is to use 1's output slot design with 2's input slot design. Let me know what you think.