I am waiting for SAPX to get back to me regarding making a set of fully adjustable dampers. But I agree with you that this is only part of the problem.
MMC do not seem to be taking this problem to seriously, I have not been in direct contact with them, but I know Williams' (the dealer I use) initially said that MMC had told them that there was no problem with bump steer.
I do not feel that my car is dangerous to drive, or even that unpleasant, but I do feel that there is room for improvement.
Will MMC give us all their "fix it kit" I doubt it very much, unless it is deemed by someone to be dangerous and as a result they re-call all 3 wheelers, and I can not see that happening.