As always, make sure you have a backup for any file you edit

You should be able to find the offending lines in the panel.cfg file and 'comment' them out. Place a double slash, //, in front of the line(s) and FS will ingore the line.
By commenting the line, as opposed to deleting it, you can re-activate the line by removing the //, if its the wrong one.
To test your edit you have to re-start FS, or if your multi-tasking, first select a different a/c and then reselect the one your testing to force FS to reload the panel.cfg.
Those smoke systems in a/c that I fly have the lines in a [Vcockpitxx] section. Although *.gau file names are 'cryptic', they generally give you an idea of what their for, or the author may have placed comments near the line.
Cheers,
Dave
p.s. There can also be lines in the aircraft.cfg file, [Effects] and/or [Smokesystem] sections, but from your comments yours would appear to be in the panel.cfg.
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.