Is there any way to know how much I can mess with the membership tables in VWD, without causing major problems? For example in aspnet_Users the UserName and LoweredUserName fields are both nvarchar(256). There doesn't seem to be any reason to store LoweredUserName at all, given that you can lowercase the name programmatically on-the-fly. And 256 characters seems a bit excessive for a User name.
Same thing with Email and LoweredEmail in the aspnet_Membership table.
Obviously I could just mess with them and start hacking away to see if anything bad happens. But, I'm concerned about something I might miss that comes back to haunt me much later in the game.