One of the close future rewrite is the HTML filters bar.
Cook is generating very ugly one for the moment.
This released version has not changed the generated code. Only the builder. Now I am gonna pass to the next step wich is curing very well the generated HTML.
I am gonna have a look for you on that, but it will not be the final one.
The reset button comes with the search bar. If you do not instance it, you do not have the reset. I know it is stupid, but this is how it was before. I do not remember really why it is like this, but I copied the joomla way long time ago.
In facts, if you instance combos, you do not need the reset, but for calendars, it is true you are right.