Combine alt-tab to Ctrl-Alt-Up/Down?

[Nguyen Thai Ngoc Duy <pclouds gmail com>]

Hi,

I find myself usually do alt-tab right after moving to proper
workspace with C-M-Up/Down. C-M-Arrow currently shows a grey boxes,
representing workspace movement. Should we show alt-tab panel, perhaps
limited to apps on current workspace only, instead of those grey
boxes? It'd help me recognize if i'm on right workspace, then alt-tab
(or alt-right, alt-left) right away without releasing alt key.
-- 
Duy