Currently you cannot train beyond a 5 skill. That's fine. But how about allowing items to go beyond the limit. This allows for more powerful characters to be developed, provided of course they are lucky enough to acquire the right items. The Skill Plate then would have to be changed to show skills above 5 and their benefits. Also I would imagine you want to look at and rearrange what skills are available on which types of item slots as there are 11 slots and you probably don't want to support 16 (5 + 11) skill levels. This of course may change the balance of the game a little where areas or bosses should probably get beefed up too.