this kind of extension is "force-quit" extensions. In mxi file, the property of "force-quit' is set to "true." when user install this kind of extensions, they need quit the running appllication first.
If your extensions will not overwrite DW files, you should remove "force-quit" and "requires-restart" attributes from mxi files, then users will have better installation experience.
yes, the problem was the "requires-restart" attribute,
There is a method to force Dw reload extension with a command in the Js code of one extension? so I can reload extensions without the user need close, delete Dw cache file and re-open Dw?
I'm afraid there isn't any methond to satisfy your requirements. Maybe you can get some helps from DW forum.