Is it possible to do a search for occurences of 'execute macro' that use a parameter?
In KM 7.3 the search was enhanced to include the parameter field so if you know specifically the content of the parameter you can search for it. However, it does not look like you can do a search for all execute actions that have a non-blank parameter, which is what I think you’re asking about. For further info consult this page in the wiki: manual:Search Strings [Keyboard Maestro Wiki]