On many electromechanicals you will find under the playfield or in the
cabinet a set of plugs or a switch that says "LIBERAL -- CONSERVATIVE".
This is usually just an option that controls the amount of scoring, the
frequency of an award, and so on. LIBERAL means higher scores, longer
games, and more extra balls and replays. CONSERVATIVE means lower scores,
shorter games, and less extra balls and replays. 3-5 ball play is always
labeled as its own plug or switch, except that sometimes it will also
control some scoring, frequency of an award, etc.