Ok, i made some improvement, we while still have one problem, but i don't think we can't manage it (the /dev/fuse thing).
I'll finish it tomarrow (i'll sleep a bit right now )
1.Yeah there will be one, but one which already exist, because since everything is mount on /dev/fuse, the only way to unmount one device is to unmount all of them. That's bad, but that's how work fuse and we can't do nothing against it.
2.Real backdoor would be to use the official one. But if you want to mount via ntfs, i plan to made an option that i'll call ntfs-old to mount it with ntfs, so you'll be able to mount it like that: pmount -t ntfs-old /dev/sd*.
3.I'm not developper.
@Poka64:You mean, auto mount with ntfs and manually mount with ntfs-3g ? that's an option. What do other guys think? An other idea could be to create a nautilus-script which could unmount an NTFS device mounted automaticly with ntfs, to mount it with ntfs-3g. An 'mount it with Full write access' option.