Is it possible to change the width of an action button? It seems that the width is fixed.
Right now the width is fixed but it should be easy to change. The list of buttons is rendered in GLMMorphicActionListRenderer; then in #morphFrom: the width is set to default value. We can introduce a #buttonWidth: message in the presentation that sets the width of the button. Do you want to give it a try?
Likewise is it possible to change the layout, so the buttons are on top of each other and not side-by-side?
For changing the layout you can configure the presentation with #beVertical.
Finally it seems that setting icons does not work; tested in Pharo 6 and Pharo 7: (screenshot above). Maybe it works only for the toolbar icons?
I made a small change so now icons are shown (latest version in moose).