Why?
Because I sometimes (more like always) forget to change the status of my files from on hdd to on cd or to deleted. Or sometimes I redecide that a anime is watchable even if I have deleted the first few episodes.
And so there might be several of my animes with a wrong status. ok I could just go through every anime and check it, but this would take like forever with around 4400 episodes in my list.
The only problem i see so far is if 1 anime has multiple status (statuses? I dunno

So this 4 options would be what I want:
show only anime on hdd
show only anime on cd
show only deleted anime
show only anime on unknown
would also be nice to see some stats regarding this. like 50% of your animes on cd 10% deleted... yeah I am a statistik freak

and sorry if anyone already requested this. couldn't find it.