Also, if you don't want to buy Enterprise, you can also look at hiring a Consultant to write just this zenpack for you. It may fit users needs better if they don't need the rest of what Enterprise is (Now, Service Dynamics etc). There are several ZCA consultants that may be willing to talk to you about your needs and of course there are other consultants in the community.
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James Pulver
ZCA Member
LEPP Computer Group
Cornell University