We now plan for 10th of April. But unfortunately there exists a tiny probability that hierarchical tags wont' make it into this release, they are quite tricky to implement. Right now the following commercial features are implemented:
- Multiple notebook support
- Export to HTML
- Pasting notes on Ctrl+Enter

Sorry for the delay.
I think your suggestion is sound. If people vote for it, it will be implemented without many problems.

Check out this suggestion: http://roadmap.cintanotes.com/topic/92954-tag-sidebar-display-only-related-tags-on-double-click/

To avoid the Linux dilemma - "You can configure everything. And you f*cking WILL be configuring everything.." Sorry for the language ;)

I wonder that too ;)

It is already fixed in 1.6 Beta 2

Please specify the CN version.