This is not really up to Dean though as he's using a standalone library to allow read access WHILE MM is running. Outside of that it's more or less in hands of creators of CFW and / or Payload to include the NTFS support to be able to play games form such drives.
I have not ran across one that dont work. You will however have the default background for the new one unless you make one for youre theme of choice named AUR4. I like the way the c and gbox are set to match up with the background.
I wish everyone who keeps asking for NTFS support would take a minute and understand what they are asking before just reposting the same thing over and over. First, as was stated above Dean is using a library to add NTFS read support that he didn't write. The original author of that library will have to add better support for write operations to flesh it out.
Second, even if there was a fully functional NTFS library for homebrew applications, you still have to leave said application (i.e. MultiMan) to play a game and therefore loose the application's support of NTFS. It is up to the CFW authors to add native NTFS support to GameOS before having support for it in a backup manager does you any good.
Dean, I'm not sure you would be able to incorporate this into this already fantastic app. But what I was thinking, is it possible to retrieve the SND0.AT3 and ICON1.PAM from the game and have them play in multiman at the game selection menu as previews when we shuffle through the games? Haven't seen anyone mention this before.