хорошие новости)) ура, уже сделали и фиксят до конца:
http://www.prestashop.com/download/changelog_1.4.0.15.txt
[*] MO : Added an "Enabled filters" zone in the layered navigation
[*] MO : Added real time criterions refresh for the layered navigation block (still in progress)
[*] MO : Added some modifications for the layered navigation block (still in progress)
[*] MO : Fixed small bugs in the layered navigation
[*] MO : Instead of not showing them, empty values for layered navigation are now displayed and disabled (like on Target.com)
[*] MO : Layered navigation module updated
[*] MO : Layered navigation module updated
[*] MO : Layered navigation module updated
[*] MO : You can now filter by attribute and color (+ color picker!) in the layered navigation
[*] MO : You can now filter by feature in the layered navigation
Вот так вот ;-) ждем финального релиза без всяких платных модулей за немеренно денег)