As mentioned previously, the movement reduction was not supposed to be total. This was an error, which may be due to different movement rates in ss4. Either way it's being corrected so dont worry about that.
As for traits not being the best place to implement supplies, traits are the only way we can implement supplies unfortunately and we have to accept that there are limits to modding. I wanted gradual desertion but it was not possible, so I thought about how to represent the same effect. The answer was what I did, I made an army less capable of fighting.
It is not possible to use crusade desertion on other armies. Would that it were.

Believe me, I looked at everything that I thought would work.
For crusades, use supply ships like King Richard did (once the movement has been corrected if not before).
May I refer you to the previous answer. Thanks for the post.
Oh thank you Sir.
Already done. Quark has posted one somewhere on this forum.
Please explain about "really screws up factions in mixed religious areas". What is happeneing? Do you mean you don't like what is supposed to happen or that there is some error?
We are modifying the traits anyway. I'm sure you all understand that a newly released mod containing many different mods will require a period of tweaking.
Thanks for your patience
