You can copy and paste into the MKS Toolkit shells on Windows (with the exception of Win9x/Me) with just the mouse buttons. Right click on the Title Bar, select Properties and then check Quick Edit on the Options tab. Use the left mouse button to mark text, the right button or return key to copy it to the clipboard and the right mouse button to paste from the clipboard.
To enable pasting in the MKS Toolkit shells on Windows 9x and ME disable Fast Paste. Right click on the Title Bar, select Properties and then uncheck Fast Pasting on the Misc tab. Once enabled, use the buttons on the toolbar to mark, copy and paste.
Alternatively, you can use the Edit menu that results from right clicking on the Title Bar to mark, copy and paste. | 
