Currently (version 1.2.23), IceWM's option in ~/.icewm/preferences "TaskBarWorkspacesLeft=0" places the workspace-pager right of the clock and even the taskbar hide-button! (see attached picture for a screenshot)
IMHO right-placing of the workspace-panel should place it left of the hide-button (and preferably of the clock).
A yet better option (from the user's standpoint, that is!) would be to actually be able to determine the relative position of each element (menus, workspace-pager, CPU monitor, etc) in the taskbar.
The option in the ./icewm/preferences" file might look something like this:
# Placing order of elements on the taskbar
TaksbarElementOrder=AppsMenu,ShowDesktop,WindowsListMenu,ToolbarApps,OpenWindows,Tray,NetMonitor,CPUMonitor,WorkspacePager,Clock,HideButton
Example of the current right-position of the workspace pager