I was going to mention this as well. The Load Limit column on the movement chart (p. 128) lists '--' opposite Creep pace, which suggests no limit to the amount that you can carry at a Creep pace. I'd put something like 150% or 200% there, indicating the maximum amount you can grab and still move.
When you add flying races, you might also want to note how much you can carry and still get airborne. I would suggest that if you have wings like a Hirazi, you would need to be able to move at at least 3x pace (which would keep your limit to 45%).