You can also go higher with swap by the same method, i.e. either replacing the first space or the leading tab on the next line - so 256;<tab><tab> becomes 1536;<tab> (for example). I did this with mine and also upped the apps partition to 10752, both worked perfectly. The tabs are the 09 (hex) values that you can see in the screenshots posted above, but I'm sure you all knew that already, right? ;-)

Incidentally, this used with Robbie's excellent BackupMenu program means you don't even have to reinstall anything - simply use it to backup rootfs and optfs, copy the generated tar files plus MyDocs onto your PC (via USB is best, but SSH/ftp works too), flash the edited eMMC image then use BackupMenu again to extract the tars into the new, larger spaces and finally copy MyDocs back (again, by USB, SSH, ftp etc). Obviously, you won't be able to copy all of MyDocs if it exceeds what is now available on the FAT partition. I know this works as it's what I did myself