That's a very good idea but they might as well toss in a few guns which are simple to produce. Better yet, why not vary the cannon as well, and for example, include a morter or rocket launchers or some other non-standard cannon.
Now, getting back to the crews, I would like to see some men defending their guns from infantry or cavilry attack.
Back to the guns, a wrecked carrage or some other artillery "causulty" might be fun
No set of artillerymen that I have yet seen includes the men who hauled on the ropes (traces) to pull the guns into position - I would like to have some of these for Napoleonic sets. Also, artillery figures for some of the smaller nation i.e. Germans, Poles, Spanish etc.
You might look at the Yankee/ Confederate Engineers on PSR that Revell did a number of years ago. The have men pulling ropes that I use to move cannons back in position. If you swap hats, I would believe they could serve in other wars !