Applications do not appear in the taskbar when right clicking. For example, I downloaded Nilesoft Shell, and when I Shift + Right Click on the taskbar the "Shell" option should appear to configure it, however, the modification that Start11 v2 made to the taskbar does not allow applications to appear when doing Right click on the taskbar.
EDIT: Another user posted about this a month ago, but the issue was not fixed. Using Enhanced taskbar doesn't allow third party apps to be available in the Taskbar Right Click.