I wouldn't use CS for this kind of thing, even dodging, as I find those rules in the book a particularly ill-conceived way of resolving such tests as altering the difficulty number because CS is a larger number also messes with the impact of the dice roll and its affect on the outcome and the scaling of bonuses and penalties.
Instead, to keep all action resolution on the same scale of difficulty number, and with the same scale of bonuses/penalties, I'd go with a straight action check roll with alterations based on applicable circumstances or even closely matched Disciplines.
For instance, in the case of dodging. If it was a falling rock, taking your PC by surprise, I'd go with allowing a bonus if the character had Sixth Sense. For a falling object that has been seen I'd go with a bonus if the character had (for eaxample) Hunting as this "enables a Kai Lord to move with great speed and dexterity". This bonus could be the PC's rank halved as written in the rules or if the discipline just offers some overlap to the task at hand then this could be reduced appropriately.
Lifting heavy objects I'd reward more through co-operation and correct planning. Or if the player described his chracter as being unusually strong I may give a +1 or +2 to the roll. Another alternative is to use the rank of the Kail Lord halved for raw challenges that don't relate to a particular discipline as that denotes a PC's experience and ability.
In the same vein you could also set bonuses if the PC has passed a particular Kai rank as we see in the books (eg, "if you are the rank of Savant or higher then you may add 2 to the roll").
Hope that helps.
