Most of our users are internal, but do you have many users external to your company.
Can JIRA use a mix of Active Directory accounts and local accounts.
Are there any pitfalls that we need to be careful about?
Yes, it can work very well. The only point that you should be aware is that if you have the same username coming from both the directories, it will result in JIRA authenticating the user with the first directory in the directory order. This can confuse at times, and as an administrator you should be aware of this.
https://confluence.atlassian.com/display/JIRA/Managing+Multiple+Directories
They can work well BUT you need to be careful to setup some rules so they do not overlap.
Here is an example of my current implementation which is quite complex:
If you do not set clear rules to prevent overlapping you are preparing for an administration nightmare.
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