I found out that you have to show the nvidia and physX logo also in demos as the License Agreement says(section 6. / page4):

NVIDIA EULA

so it is saver for us to add a physX and nvidia logo in our demos! I will do that, too!

P.S.: the latest version has four new functions for locking/unlocking a single or all physics entities for any translation or rotation axis.
@picoder: I will check this "fps drop" maybe I can make it faster...