While you can do this, I don't understand your exact problem here. The polyfiller.js will optimize the packages automatically for all browsers and webspace isn't that expensive (it's about 2mb on your server).
You can throw away:
The following directorys: - FlashCanvas - FlashCanvasPro - jpicker
and all js files inside the shims folder, but form-*.js, dom-extend and es5.js
But again there is no need to do this. I don't understand why this is important. The only thing I do understand is to remove *.php from the directories (i.e.: in Flashcanvas...)
If you want to have as close as jQuery's datepicker you should set some conig options like startView, showOnFocus and so on for the date widget.
<style>
.date-input-buttons .step-controls {
display: none;
}
</style>
<input id="date-1" type="date" data-date='{"startView": 2, "openOnFocus": true}' placeholder="yyyy-mm-dd" />