I was already thinking of making a script with "dynamic" commands so it may as well be this one
Expect an update failry soon to include this
Just to update, I've been doing some work on this through the night and the only thing left to do is to make ComboBox control update (which as far as I can tell, means emptying it and re-adding all the elements). It is now possible to change the commands for all exisiting search engines. I do need to make a slight modification though so that new entries aren't left blank, but rather must be filled in when it is added
Updated to fix a few bugs...
Adding preferences and dynamic commands shortly
Sorry to double post, but theres a new update to the script
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