Would it be at all possible to lock them mod to certain maps with defensible, but not exploitable, locations?
It's almost balanced as-is without exploitation of terrain.
If there were more ranged unit waves, and more challenging NPC unit compositions, etc, combined with non-exploitable locations, then 100% exp rate might be reasonable.
I suppose DTV would still get much higher exp than other modes, but I think cRPG could use a mode like that.
As long as it's not effortless, and not drastically higher exp/gold.
PS. Would it be possible to add a degree of randomization to DTV? I.e. have 'levels' which could be any of several different unit waves?
It would be a lot more fun if you weren't sure if you were going to get the easy-peasy nords with only 2H axes and throwing weapons, or if you might get the head-smashingly annoying ranger types, in chainmail with bows, swords, and shields, or a small set of ultra tough boss units.