Thanks very much - I'll take a look...
...OK...
...No... don't seem to see any variable that I can't account for - all appear to be quest-related, active-spell-related (eg stoneskin) and personal-item-related... Staff of Magi had 11 variables; deleted them all and still no Speed... funny that there doesn't seem to be a variable for wearing Boots and other things, yet Magi Staff is indicated (?)...
As to whether he was hit by a bad spell affecting movement, I honestly can't remember - I know ALL members of my party have been amateurish enough to be hit by some type of Hold at one time or another.

I don't suppose you or anyone else would know any specifics regarding the item you mentioned that might have caused a permanent movement handicap? Or maybe it was a creature that did it... I may have used the Rod of Resurrection on him once - a couple of charges were used, that's for sure - I think

I brought him back from the dead once during the Unseeing Eye quest... Hope that wasn't it - if it was, then in the next game I'm reloading until everyone comes through a battle alive.
...'d be interesting to know what the reason was, but as it is I'm treating it as one of Edwin's personal disadvantages, sort of balancing out his raging-maging abilities.
I did see something in ShadowKeeper I didn't quite understand, though -
SPOILER --- SPOILER --- SPOILER ---
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X -- I've been all the way through Edwin's quest with the *scroll*... I looked at HIS stats in ShadowKeeper and they indicate he is a FEMALE human, lawful evil... Which is not what his Records page in the game says... I changed that too, but it didn't affect his Boots of Speed problem.