99% of students have mediocre buzz rolls at best. With the captive audience aspect of pit
warmups, you could instigate a great deal of improvement in this area, for that individual. Be sure to write the parts in a way that forces them to address the concept of freeing themselves from skeletons in favor of finding the perfect roll speed for each particular dynamic or phrasing shape. So, lots of cresc/dim, and tied vs broken. If you have trouble thinking of stuff, just rip licks off from the Goldenberg. That book is teh awesomez.
Also, I always like to put lots of juicy tambourine parts in shows. It really augments that style of music well. Thumb roll and shake roll exercises would help the student a lot. Especially if they happen to be a music major.