Gabrielle covered the first two.
The third question is worrying - "populating data tables used by JSD" implies you might want to write data to the database outside JIRA. Don't. It won't work and you'll break it.
If you are just questioning the licence scheme, for JSD, there are three types of user:
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot