That’s a helpful suggestion thank you! Sincerely. Let me try to clarify: with any docks that I have used (dash to dock, plank, and whatever comes by default in Ubuntu which I think is a modified plank, same with elementary), when you fill up the length of the visible dock area and add more icons, they are hidden. You can then use your mousewheel / touchpad scroll to slide the icons so as to scroll to the hidden ones.
Now, my touchscreen works fine and I can do things like scroll web pages, tap icons to launch, tap fields in an application and even type in the on-screen touch keyboard.
But what I cannot do is move the dock icons to scroll them along the dock to reveal the hidden ones that are past the dock’s end.
In theory since it’s a scrolling function, the intuitive thing would be to drag them with your finger using the touchscreen. But this doesn’t actually work. Clearly, it is not coded in the same way that most things are that respond to that kind of interaction.
I tried using a few dock applications and on a few distros. It doesn’t work anywhere.
So that’s my goal - to be able to drag/scroll the contents of the dock to get to the ones that are hidden past the end.