If Kpowersave is stilled, and will run, all you need to do is re-create a desktop icon, and edit Kmenu and add it there.
To create a desktop icon, right click on open desktop space, from the pop-up, select Create a new, Link to an Application.
On the General tab put the application name in the bar. Select a new icon, by pressing the blue gear, you may have to hunt around for the correct icon, or use what ever one you like. Click the application tab, and in the Command line, enter
( this is what is in mine ).
To edit Kmenu, right click over the start icon ( mine is a penguin... ) and select 'Menu Editor'. It takes a bit of mucking around to figure the menu editor out. You can add the icon any where you like. Basically, once the editor opens, right click in the menu structure where you want to add the item, it will pop up an 'add item' put the name in here, and O.K. Then just fill in the right side, the command is the critical part. This is where you add kpowersave.
Hope this helps.