I see the role of superswitcher to primarily be as a replacement (perhaps a
suppliment?) to the GNOME applets Window List, Window Selector and
Workspace Switcher. The functionality of the first two applets are covered,
but two things about the last could be added to superswitcher...

1) In the workspaces view, allow drag and drag of windows between workspaces.
2) Show windows' icons on workspaces.

In discussion with Nigel, he misunderstood what I meant by "drag and drop
between workspaces" but created a new feature idea :) ie, dragging a window
to the space between the graphical representation of two workspaces (or
perhaps just in a space at the end) would create a new workspace for that
window - a bit like Super+Ins but for an existing window (without the extra
Super+Shift+Right step). Nice.