Thanks, will do if my build turns out not to be usable.

Interesting, thanks! Logs are usually very compressible, so this could help quite a bit.

I think I'll add it, but most probably not enabled by default - while most common Linux editors can directly work with compressed text files, there might still be some other tools or users of other desktop platforms (Windows ?) where the tools could have issues with opening the gzipped logfiles.

Also, I wonder if there is a slightly bigger chance of file corruption - any idea how often does the gzip file flush or if the output might become unreadable if modRana or the device crashes without cleanly closing the file ?

Still, the log file is already a debugging option, so the people using it should already be knowledgeable enough about it to decide if they want the log files to be compressed or not.