Changing the "XP required for next level" can be considered a temporary cheat, if that's all you do. It'll allow you to gain a level, but the XP required for the actual next level will be reset accordingly. Ie, if you are level 10, and you modify the XP required so you can advance a level, the XP required for next level will then show for level 12.
As for using UGE... You can do so, but with save game editors out there it hardly seems worth it. Why bother marking your XP/etc down when they'll happily tell you how much you have and then let you change it?
O.R.
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