DX100 Rem an instruction

I'm going to go with no.

You can open a job in notepad and place an apostrophe in front, save it, and reload into the controller. I've done this but can cause issues with other people or myself with why this line did not execute. It gets difficult to see that apostrophe on the screen or on a computer.

No. Nothing like this

If you open the job offline you can add a single quote (') before an instruction to make it look like a comment then load the job back in.