Gaming Want to confirm something about read/write flash

[Raiser]

I'm downloading the homebrew CSPSP v1.6 and the creator says that they game now READS the flash, but does NOT WRITE to it.
He says it should be safe, but gives a warning.

Can anyone confirm that it's 100% safe if it only reads the flash?

Thanks

EDIT: Oh just asking, but does CSPortable v0.79 support single player? Because when I set everything up under single player (including max 8 players), it's just me. O.o
Is it multiplayer only?