The broken "WHERE" button was an issue in a previous version of Dreamweaver that Adobe has fixed in recent builds. I think if you update Dreamweaver to the latest version then it would work.
Error #3 it looks like this is a bug... I've fixed it, so if you reinstall the MySQLi server behaviors the trigger should appear now.
#4 yes, type it in.
Error #4... In the newer version the tab is "Store Values" instead of "Session Values", but it works the same way.
There are a lot of tutorials that need updates. I'm working on getting it organized and starting an effort to remove or update out of date tutorials. However it will take some time to get to all of them.