1. Yes, you can deploy as many Tape servers as you need with multiple tape devices connected (take a look on the Tape Device Deployment
page of the User Guide).
2. Can you clarify a bit the scenario you are going to implement? You should be able to execute a several tape jobs simultaneously on different devices, if they aren't trying to work with the same backup files.
3. No, you can use all features related to tapes with the license you have. Thanks!