This is something I really want now.
I have two damage mods to LTK from gear plus 3 pieces with +% elemental damage mod. My LTKs are doing way more damage than the LTKs of another player who has the same sheet DPS but not those damage mods.
Yeah this is annoying now, too.
I have some +elemental damage stuff that I have no idea what it's realistically doing to my DPS. It's hard to dump that stuff if I don't know. And it's hard to see if it's worth using skills because i have that on my stuff.