1 - you would have to add fields to the user table and just insert the data, no prob
2 - if you want the real name to appear the easiest way is to just ask them to put their real name in as the username - if they are not willing to do that they will not put there real name in the name slots anyway so it will not matter
3 - I would before an upgrade just copy over your hacked forum with the basic forum and then it should upgrade with out a prob - then you would have to be in the hacks again.
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