i just asked them about them doing it yesterday, maybe with just 10X leverage (instead of the 20+) to get the benefit of lloyd's insurance, etc. and they said they couldn't do it.
one of their guys said that some props are clearing through IB (no names mentioned) but he said the fees are higher than IB AND you have no recourse if those "props" go under, i.e.your money is gone.
there is also the portfolio margin account, where, when hedged, i have had up to 6X leverage.