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I'd love to have onpage registration for guests, similar to blog commenting forms:
What would need to be done in order to achieve this mod?
I'm assuming you want to program it, or get your programmer to do it, or pay for a sponsor to develop. Other than that it requires a bit of programming, so you won't get any easy answers here.
take a look at this plugin if you want to proceed yourself and create a custom page
factoid: Most questions have been previously answered, try the search box first, please provide your Vanilla version Number!
Peregrine's Addons - donations gladly accepted for "successful solutions" and addons - kind of like tipping a waiter at a restaurant
Seconded. I'm not the one to tackle this, but I think such a mod could really encourage registration and commenting. Or even put the registration fields below the comment, such that once someone types their comment, they are more invested and obliged to continue registraton.
(And I don't think it's a custom page the OP is looking for, but an addition to the discussion page.)