Huh, why did I not see that variable in the grep results... ah, that line didn't match because I negative matched 0-9 but not 'nothing' (end of line in the config file).

If it's just a configuration variable though, why bother migrating away instead of configuring it? Or even opening a ticket upstream that the 200 APs limit is causing issues if you would want to go that far. Ditching the software altogether seems radical