it might require adding to the sprx itself rather than the xml associated with it whether it's an rco or a normal xml. what would likely happen is that u'd add it to the xmb_normal.rco. the category that is. then, add the category to the sprx (forgot which it was to remove/add categories, but it's in the mfw app). then, add a new xml like with webman mod to task the tier itself. there'd probably need to be a lot of testing to see if anything was affected by the addition though. I'm not sure if it's practical, but it's interesting. u could have homebrew in one tier, and each game type in additional tiers. that would require a modification of the sfo category type though which might be difficult via hexing.