Such as? I'm not aware of any. I'd love to be enlightened.
1) Nursing the rail. With the balls close to each other on the rail. Keep them together for as long as possible.
2) One ball starting on the rail (frozen or 1 ball diameter off), and the other ball 1-2 diamonds into middle of the table offset somewhat forward of, then even with and then back of the rail ball. (multiple ways to work these shots -rail first into the two objects balls, middle table ball first into the rail then the rail ball, rail first into rail ball into the middle table table.
See how many points you can go before they become too split up.
3) One ball on long rail, other ball at the middle diamond of the short rail. Cue ball in between, Hit long rail ball first, get cue ball into the middle rail ball. Play cue ball from where it lands. Keep working this until your angles are no longer possible.
See how many points you can go before they become too split up.