As usual, this will be of very little interest to anyone but me, but it's actually made my day. I have accidentally discovered the keyboard shortcuts useful for editing fortran code in kwrite.
Ctrl+I - indents
Ctrl+Shift+I - un-indents
Ctrl + D - comments out code (by ! marks)
Ctrl + Shift + D - un-comments code
How exciting my day is today. I actually could have looked this up in the kwrite menu, so I am stupid too!