Whenever I am playing a game that takes up the whole screen, the task bar for my current theme, tenebrae version 4.0. I would also like to know if I can change the clock on the theme from military time into something with either standard time i.e. 4:30 or have something that resembles the face of a watch for the time display, any help would be appreciated, thanks!

http://joeblade.com/litestep/tutorials/game.php
If that doesn't help you could try switching to another theme before playing fullscreen games. Or you could wait for the next lsdev build which might have an option to hide/show all modules.

in my opinion it's done if u edit ur step.rc and set all modules to "notallwaysontop" or whatever the module-syntax is for "Not allways on top" ;o) (u find the syntaxes in the readme-files for the modules). Or u can write a little script to hide any module that loaded and another one to show them after playin'. in this case u have to load mzscript.dll or any other module like this to create scripts.

If you want to change the clock, bring up the theme popup [shift left-click the desktop]. It may be in the settings; I don't know whether it is in 4.0 -- I've got 4.5. You may want to check out tenebrae version 4.5 ... I use it and I don't have that task bar problem.