Yes, it sounds really overpowered, but let's be honest here: if you're not overpowered at a high level, you're doing something wrong. Plus, it's not like other weapons in the game aren't overpowered (i.e. Sunder, which also has a Constant Enchantment).

Back on topic: I went to the CS and opened up the Morrowind.esm and the Tribunal.esm. After that, I went to the "Enchantment" tab and selected the enchantment nerevar_blade. I switched the enchantment type from Cast on Strike to Constant Effect. However for some reason, it subsequently changed the range from Touch to Self. In other words, every time I use the blade in-game, I get damaged by Trueflame's fire damage. Hitting enemies does nothing but deal regular weapon damage. I can't change the range once I set the enchantment type to Constant Effect for some reason; the option gets blacked out.

Help?