I have been reading through the manuals, but cannot see a way to do this.

Can I eject media from a robot by pool name? I wish to script/cron this, and
am drawing a blank.
I have several pools that are backed up locally, and sent off to
IronMountain daily or weekly, depending. I wish to script these tasks, and
the pools are the only constant that seems feasible. I can not do it by
client, since the clients are also backed up on another schedule and kept
locally. (Different schedules, but highly redundant anyway).

Example:
Sent off daily;
pool1 pool2 pool3 pool4

Sent off weekly;
Pool5 pool6 pool7 pool8

Sent off bi-weekly;
pool9 pool10

I want to be able to eject, preferably by robot, each pool.

eject <robot#> <pool# or ID>
prompt "Empty the hopper on $robot"

Changing this process has proven to be impossible, or at least improbable on
a Herculean level.