RJ TextEd

Currently RJ recognize SCRIPT RUNAT="SERVER" as Javascript instead of ASP.NET, is it possible to change that setting or to implement this in new version?

Should already work if you use the ASPX highlighter. The ASPX highlighter should be used if the file extension is .aspx. You can add more extensions if you need to. You can also change the highlighter manually in the toolbar.

The default source language is set to C#. You can change this in options. I'll add support for though.