It does at least since now, from Ricotz’ PPA, version:
2.31.2+git20100527.155bee38-0ubuntu1~10.04~ricotz1
** Changed in: gnome-shell (Ubuntu)
Status: Triaged = Fix Released
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Alt+F2 does not support TAB completion
https://bugs.launchpad.net/bugs/481545
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Thank you for your bug report.
This particular feature has already been implemented in the current
(unreleased) development version of GNOME Shell, and will be available
as soon as Ubuntu updates the gnome-shell package to a newer snapshot.
** Changed in: gnome-shell (Ubuntu)
Status: New
