Hope it could be an option in the backend in future version.
For the reasons i explaned, we cannot leave that to the user descretion.
Unless someone knows exactly what this is, it can very easily render the entire component useless.
Before adding the label to the url, check if there is special characters in the label and replace them.
This is not an option too.
You cannot get back the original values if you change them on the fly, simply because the changed value is not stored somewhere (like the Joomla aliases).
If you want to have clean values (without special characters), make sure that you save them this way.
Custom field types such as Lists, Radios, Checkboxes, give you the way to create a value and a label for every option.
We use the value in the url and the label in filter labels/texts.
I am closing the ticket as resolved.
Kind regards,
Sakis Terzis
Founder and Lead Developer