I firstly thought even about any automatical setting of a lineup (according to minutes or players skills etc). Any automatical scrimmage is another way to make life easier, but then I realized that it would be contraproductive.
If you want a scrimmage, go and ask someone for it. After there will be any search engine or something or any more automatical way, it should be done right away like - after the cup, your assistant will set these scrimmage by himself. As a manager you have to take care of your team. Sometimes it is fun, sometimes a duty.