To anyone following this, IB has now got this up and running. I converted my traditional IRA earlier this week to my Roth.
Go into Account Management in the traditional ira and there will be a link on the left menu (I believe under funds management but I can't remember). In my case the funds were converted that night, although they did say they will not do a conversion over options expiry weekend.
Not sure how else you could convert ... unless you wanted to change the account type but I don't think any broker will do that for you.
Just transfer the money to a bank first, then deposit it to a Roth. I did it before. IB didn't support the direct transfer. It was a bit of a hassle to convert.