Thanks for the detailed post and thanks for your interest in TemplateToaster. Can you please provide some more details about the crashes that you faced, like some steps to reproduce few.
Predesigned Templates are currently not fully ready for the v7, we are working on few improvements related to the existing templates. We are also designing lot of new templates for v7
Header video feature should preview in browsers perfectly fine, regarding your issues I will assign it again to our testers for retesting. It'll also be very helpful if you give us some screenshots showing the issues.
You can easily have the "search" and "date and time formatting feature" if you use a CMS like WordPress, Joomla etc with TemplateToaster. I will forward your suggestion related to "A+ A- font resizing feature and "new textures" request to our dev team. For a CMS like WordPress you can add this easily with the help of a plugin like: https://wordpress.org/plugins/tags/font-size/
Adobe Flash is in its decline phase and is not supported by major industry players: https://www.google.com/search?q=decline+of+adobe+flash&oq=decline+of+adobe+flash
Apple on Flash: https://www.apple.com/hotnews/thoughts-on-flash/
For any new feature request you can list it on our uservoice page: http://templatetoaster.uservoice.com/
Here I thank you again for this detailed post, we highly appreciate it. While above are just quick pointers we'll definitely consider your suggestions and feedback in our next project meet.