MAT files don't give me any trouble, I must say; I usually stuff them in the Cameras library where there's more room, and change .pz2 into .cm2 accordingly. I've never had an occurrence of lost textures as a result of that - if they worked before, they worked afterwards. I realise how little help that is to you. :/ As far as I know, the only poses you mustn't move are the DAZ INJ and REM folders, which are (wrongly) referenced by some character packages. You also mustn't move the !DAZ folder, but since that doesn't appear in the libraries or suffer from the limits, that isn't a hardship.