How about supporting functions like ABS as EXP in a better way than just as a function name.

Deedee, On second thought I think I totally disagree about the rendering. Its meaning is totally depending on what meaning you as the creator project on it. That may be fine for personal documentation of troubleshooting but this has no longer to do with converting a spreadsheet formula in a mathematical notation format. In essence you create your own shorthand here, and while that is totally fine for personal use I feel it muddles the discussion a tiny bit.