Done, the TXo has an incredible 150 lines of extremely terse docs.
Besides the ER operator, I added some others that were missing: PARAM.SCALE, EXP, and such. I didn’t conduct a full review of commands in the online docs, so others may very well be missing.
I’m not 100% that 18 chars will fit to the right of the separator so I flagged the few that ran that long with comments.
I just need to know where to send it.