The dropdown supports 2 drop layouts these are default dropdown and dropdown with second level as navbar. You can also use this module to build a general menu in sidebar (leftColumn, rightColumn) without superfish effects.
OT Dropdown Menu supports Prestashop 1.5 and allows you add both internal links and external links.
Back Office demo:
(Go to "Modules" then find "OT Dropdown Menu" in "Front Office Features" section)
+ Supports Prestashop 1.5
+ Supports browsers: IE7+, FireFox, Chrome, Safari
+ More easier to add links and supports SEF url when SEF url mode enabled
+ Supports simple drag & drop sorting
+ Dropdown layouts: Default dropdown, dropdown with second level as navigation bar
+ Parameters: Dropdown speed, dropdown time delay, dropdown effect, show arrow mark-up
+ Support hooks:
+ Top (hookTop), MenuBar (hookMenuBar): dropdown
+ LeftColumn (hookLeftColumn), RightColumn (hookRightColumn): vertical menu list without superfish