There isn't something to set in vb that would do that. You'd have to write some plugin that hooks into a location during the registration process. It would have to be one that occurs after a userid is assigned but before the end of the registration process. Then you'd have to insert the link there - member.php?u=$userid . And, you'd have to run a query to do this for all your current users also.
Where do you plan to have users 'see' this homepage link? You could just change it in the templates - <if homepage is blank> show member.php?u=$userid <else /> show what they input </if> Also, if I recall, if the field is blank, no one sees that link so it isn't even available to people to see/click on so why worry about it?
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