I'm not an expert on this topic, but I've done some poking around and would be happy to know if I'm right/wrong/stupid/other.
1. Yes. HTML5/CSS3 is for everyone. ?The plugin is freely available in VSCode, etc.
2. You can coordinate join numbers with the developers and just put a TSW-1060 in your code. ?Or you can use the contract editor, which is probably a topic for a new thread.
3. Crestron says an app for that is "coming soon"
4. Yes! $10/mo per processor license.
HTH.
Michael
Michael Block