by default priority you mean that you would to have preselected priority field on create screen?
Update: Version 1.2.0 have just been released, where it's possible to indicate Default value for each Project & Issue Type pair.
please fell free to raise an issue for that on our service desk:
that's definitely something what we can add to Extended Schemes for JIRA not only for priorities but for Resolutions and Link Types too.
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