No mailing list, issue tracker, contact emails.
Seems a bit off given this is the standard package for primer design.
Have you looked at the Sourceforge Support page?
There is a feature request tracker and project member's mail addresses.
You might get more help from the folks who worked on Primer3Plus.
They were touching it more recently, and might be more receptive to input?
This is their paper: Primer3Plus, an enhanced web interface to Primer3
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version 2.3.6
Yes, these seem to be the only obvious available sources of support.
The feature request is dead if you look at the dates. Still waiting on stuff from 2007 to be triaged. The email addresses are all sourceforge so I assumed they wouldn't go anywhere much.