I have no idea how to write an addon, but I've been using DeuceCommander for years as a one stop fubar plugin UI. Since 3.3 the right click functionality no longer works. The addon uses the old Dewdrop 2.0 library.
I would like to know if there is a replacement for this addon or
how I might go about replacing/fixing the right click function so that I can continue using this addon? Thanks in advance for your help :D
Dropdown solutions don't have a lot of support currently with Blizz providing a config UI and all.
I don't know of a direct replacement of Deucecommander. A more recent solution would be to replace your fubar addons with brokers, use a broker based display, and get a first level dropdown via YssDrop. That won't give you deeply nexted dropdowns but will give you broad config of a lot of addons through a single interface.
You could also grab Niagara... it uses the Waterfall lib instead of Dewdrop, and provide a window-style interface instead of a dropdown-menu interface. I don't know what would be wrong with DeuceCommander, but I'm not going to install it to find out, and I can vouch for Niagara working fine.