What you want from them is their enthusiasm, their heart, their soul, and those of course cannot be offered at any price. The amount of communal participation in prayer is in inverse ratio to the combined vertical and horizontal distance between the leader of the prayers and the first occupied row of seats. Isn't it odd that people who have attended services regularly for twenty years still have to be told when to stand up. Indeed, a visitor from another planet, would have to assume that most services were designed primarily to make an occasional, non-Jewish visitor feel comfortable. What would happen if services were designed instead to make the regulars feel at home.
Responsive reading is filth.
The function of liturgy is not to ingest new information. You already know everything in the prayerbook. Liturgical novelty of any kind only keeps the wrong part of your brains awake. Indeed, the more regularly Jews pray the more they pray by rote and the more they pray in Hebrew. A gimmick is a way to get someone to attend services which has nothing to do with the service.