markus
I just had an idea which would be practical for our wiki:
On the wiki page, you could define placeholders by adding the % sign before and after a word. For example, I could define %DOMAIN% as a placeholder.
After saving this page, a form containing all placeholders would appear. Next to each placeholder's name there would be a textfield allowing the user to define the value of the placeholder. Afterwards, the placeholder's value would be instantly replaced on displayed page, but not on the page itself.
This way, creating step-by-step instructions could be taken one step further, because the user can create just the instructions he needs.