Romcenter

In 2.71 you could move your roms to a different folder can you bring that back please I need it because it makes it easier to move my bad roms to a new folder.

On some roms if I let RomCenter Remove useless roms some games will not work anymore so I got to redownoad them is this a bug or is it something I'm not doing right

It won't be part of the 3.00, but in 3.1.
If you just want to move corrupted files, go in the parameters, and check 'move corrupted files in a folder' and select a folder.

Can you give me a example of useless roms removed ?

Sure try to Remove useless roms from these games and clones