At best, it will require hex editing of the launcher (which is not "XMB"): if you do that, of course it will become unsigned, so it would absolutely require Enso and the console won't boot without signature patches...
It could be done with a plugin, to dodge the above issue; however you would still get references to pages higher than 10 in the app.db, which may or may not break other programs...
...and of course, there may still be some other hard limit (such as memory for icons)!