About the demo limitations, honestly there is no specific reason for these. I think it was a compromise that seemed to work for most people during all these years: all our plug-ins demos have similar limitations (now that I think about it, the choice for 4 seconds was probably because with shorter times we got bug reports for "audio glitches" that were not understood as part of the demo limitation, but I'll have to double check).
@bmanic: regarding this topic, we took note of your point, and I guess we can indeed improve the demo user experience in the future. It's just that this not the kind of things that we would change a few days before releasing, when all binaries are tested and ready.
BTW, beta testers have not have the opportunity to try the demo, so we are the only ones to blame for it!

