Actually, the flags option is custom coding, but rather easy to implement, because there's already a 'Location:' placeholder defined in the templates that render the postbit (that's what you are looking at right now). The flag hack just adds the image code while the page is rendered. There's no need to modify any templates due to this runtime 'template injection'. Most of the template modifications on mlukfc are done with these injections.
However, a gender hack would need template modifications (adding a placeholder) and this is a pain in the butt, because as soon as you update the software to a newer release, you have to add these modifications again. We will update the forum software to vBulletin 3.6 as soon as it's available (~August/September) and because of this i won't modify anything until 3.6.x is released. I might consider this afterwards.
I can however add a custom profile field, but this will be visible in the user profile only.
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