Commander is what I needed!
[shortcut]+html+Enter switches to HTML filetype [shortcut]+javasc+Enter switches to JS filetype [shortcut]+sty+Enter switches to CSS filetype Now it's not 10 seconds but 1!
Changed Geany's locale to LANG=C to make this work properly (it didn't suggest CSS filetype on top of the list whatever command I tried in my locale) but it's OK.
Thank you :)