Yes, I forgot about that. I always edit my .bin/.cue files with the database titles, so they are recognized the same.Unless the filename is the same as in plugins_data/PS1/PS1.ini, the checksum over the CUE file should be of little use.
This is a severe limitation I know, but I didn't find a better workaround.
I also think the PS1 database should be revisioned: some multidisc games like Resident Evil 2 had both discs bootable and they should appear as separate entries in Wiiflow (Claire and Leon). So in this case you can rename the .bin .cue files but you have to renounce to the database info.
I also see that it misses the snapshots