Hi there, thanks for the message.
W3 Total does a good job, but in most cases FVM will improve your score for the merging and minification part, as compared to w3tc alone (if it doesn’t on your specific site, then might as well use w3tc alone, in my opinion).
The ON/OFF button is actually a great idea.
The timestamp unfortunately is not so straight forward, because files are generated per pageview and based on requirements.
For example, if you use files a,b,c on the homepage, when you first access it, a file will be generated and reused later.
But if a post uses files a,b,c,d,e,f… the set of files is different, therefore a new file is created. That means, there’s no specific timestamp.
You can however, see on the status page the unix time on each generated filename. I’m aware that the format is not too user friendly, but I needed it to be unique, numeric and time related… so that’s the format I decided on, at that time.
If the plugin seems to not be working, there are two things you need to check:
a) If you have the fix page editors option enabled, you won’t see it working on the frontend. You need to use another browser, as an anonymous user to see the generated files. This is done, because the page editors mostly break, when we merge and minify css or js files, so disabling js and css processing, makes it work for logged in users.
b) If you hardcoded css and js files on the header.php or footer.php, those won’t be detected by the plugin. You will need to enqueue those properly, using the wordpress hooks for that purpose. http://www.wpbeginner.com/wp-tutorials/how-to-properly-add-javascripts-and-styles-in-wordpress/
As for the ON/OFF button, I’ll try to add it soon.
Thanks again