All suspension does change in characteristics as they come up to temp. Is it normally noticable? I haven't found it to be.
I have noticed with the 48mm Zokes that when I take the bike off the stand they have a lot of stiction and feel really firm until I give them a few bounces. Not enough hours on the bike to know if what you say is true, but I usually have a bit of cruisy transport before I get into the thick of the nasty stuff anyway. I personally have a feeling that the stock seals are a bit of the problem.