Start Killer hoverable?

Here's an option to do what you want using TLB and one of Yuri's utilities called PressStart (available here). To do this, you'll probably want to put it on it's own toolbar, so go into TLB Settings and create a new one (Toolbars tab). Add this new toolbar to your taskbar (right click on the taskbar, select "Toolbars", then "True Launch Bar ..." (make sure you select the one with the three periods). Select the new toolbar you created and hit OK. Add a shortcut to the PressStart program on this toolbar, tehn open up TLB Settings for this toolbar. On the General tab, there's an option to run shortcuts on hover, with an associated delay. Check that box and set the delay as desired. Now your start menu will appear if you hover on that icon, and you can hide the start killer icon in your system tray - you won't need it anymore.
I hope this is similiar to what you were trying to do and you haven't changed your mind