I bought a license for Start11 as soon as I saw aligning the taskbar to the side of the desktop was now an option 🤩
When left-aligned, application right-click jump lists are too small:

The issue appears to be due to the program icons being close to the top of the screen, and the Start11 context menu always starts close to the program icon, which means there's not enough vertically to contain the jump list so it shrinks it. I would prefer if the context menu retained the full jump list that is present when the taskbar is on the bottom/top of the screen, without resorting to having to scroll through it.
Another issue with side-aligned taskbar is that there are no window previews when hovering over active program icons.
Also, with combined icons on the taskbar, there is no way to activate an application which has had its icons combined-- clicking on it does nothing where in top/bottom alignment clicking will at least activate one instance of the application.
Hopefully these can be addressed during beta!