Mark, after all of your work, I realize I
may have been mistaken by saying that Emplode didn't like lines with the same keyname.

<- Sheepish embarrassment.
I had tried using emplode to edit the config.ini and add lines with the same keyname earlier today (trying to add exec_once twice) and it didn't take. That's what I based my earlier report on.
However, I just tried adding a line with a different keyname and it
still didn't work. I think I may be looking at a bug in Emplode that's unrelated to same-keynames. What I said might still be true, or it might not, I'm not sure. I'm trying to figure out why I've got trouble editing config.ini via Emplode right now and I haven't gotten to the bottom of it.
For now, I'm using FTP to edit the file and I'll see if I can come up with more answers later tonight.