Does the caffeine provide any other benefits for the plant, such as enhanced pollination?

Yes, caffeine does provide following benefits to plants:

1) Caffeine provide benefit to the plant in a way by enhancement of pollination process. This occurs by preferential pollination of such flowers whose nectar contain a small quantity of caffeine.  

2) Caffeine that is present in leaves and seeds is a way that kills insects thus protecting them from damage.  

3) Caffeine increases the learning ability of bees. Bees sucking nectar, having even a low concentration of caffeine showed a long term memory.

uh two lol