It is possible, yes. The widget that implements all scrollable areas supports a scroll indicator, so all scrollable widgets can use it.
This has not been done so far because the idea has been to introduce a small-font UI style when the resolution/window is low — usually the taskbar menus will have enough room not to require scrolling.
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This has not been done so far because the idea has been to introduce a small-font UI style when the resolution/window is low — usually the taskbar menus will have enough room not to require scrolling.