Customise Ubermenu Behaviour Using API

I am creating a website using Wordpress The menu is based on the UberMenu plugin it is vertical and in flyout mode. I want the menu to be persistent. a. Essential: When click on a 3rd level menu the content page is selected but the submenus stay open and show the current page. b. Desirable: When click on a top level menu or 2nd level menu the associated submenu toggles on/off. c. Essential: Written instructions on how the implementation was done so that I can support / reapply the changes if any updates to the site cause the function to stop working. For an example of the desired behaviour see [login to view URL] The ubermenu help forum advises that Persistent submenus can be approximated using the UberMenu API functions [login to view URL] Ideally am looking for a freelancer who has worked with Ubermenu API functions Preference will be given to Freelancers who can show/reference specific work done in this area before. Overview of how they will do it with instructions at the completion of the project I will send suitable bidders a URL to the site that I am working on. Please estimate hours/cost to complete the work.