Well, Wall climb would be cool with this, but it would make the levels way to easy, as the one I'm currently working on requires you to get to higher ground.
We do have a double jump playertype, although it has a regular amount of health. You would die to much and I'm not placing any checkpoints.
Also, If you could only hold one or two items at a time, because guards drop their weapons, it would be cheep too be able to carry every weapon.