For a while, I've been debating to myself if adding DR to armor is worth it or not and if it is, if it upsets the balance of the game too much to use freely.
The idea is to add some DR to armors that look like they'd at least give some extra protection than they normally give in order to increase the survivability of the wearer; for example, Metal Armor. Although it weighs 30 pounds, is in the heavy class and gives out a -1 agility penalty, its 12 DT is a stark difference from the 36 DR that it boasted in Fallout 3 (and it slighty outclassed the combat armor, while it is now outclassed by it), while it also looks like it could handle bigger, more powerful projectiles than the Combat Armor (which looks like it's more suited for weaker rounds).
Thoughts?
