Everything you say is normal… but these are bugs or missing features:
– long curves (with > 500 points) are not rendered correctly (but the cursor position is correct), this is due to rendering optimizations I made, I will correct that soon (we plan a release next month);
– there are no way to differentiate the position of a curve of its first point. But many users ask me for changing the curve position without changing the first point. I’ll look at this feature for next release.
Thanks for your feedback 🙂
PS : I’m also happy to see someone using IanniX on Linux!