Why not a combination of two stats: strength & constitution or "condition" as a new stat ? So running need stamina, too must carrying need also stamina. Carrying to much you can't run (like in DD) and after a while walking you feel (see the stamina bar lowering!) more and more tyred and you wish to go sleeping ... if you neglet this "feeling" (see lowering the stamina bar) you definitely must drop weight, otherwise you can't walk anymore and/or even fall on the ground
!
At least every kind of build need enough Condition for walking, especially running . And for each build a nice special move that use stamina (like in DD) is also great, imo.
And some big swords and other mighty weapons need more condition to use them because of the heavy weight !
For the Mages who spend many more points into Intelligence than Strength (for sure they will do):
maybe a mighty spell only builds with Intelligence high enough can use it, a spell which make their backpack less heavy for a certain amount of weight. And the more Intellingence, the better the spell !
BUT this spell works temporarily, starting with 1 or 2 hours (ingame time), time enough to go to a chest or shopkeeper.
You can see it as a Skill, but only avaible if your build spend enough points in Intelligence.
Playing a pure Mage this is a need to have, but playing a Battle Mage, this last build can invest in strength also ... etc etc ...
Besides, I like also the idea of a "Junk" Inventory tab like in Amalur, that's really handy !
