Flying Blue does this, it used to be for platinum members when I bothered with the scheme, but I seem to remember reading it now applies to lower tiers too.

I can't see BA doing this, although many would like them to, there's so many people with status they probably don't want to make it even easier.

I've never understood the argument that once you've hit your TP target there's no more incentive to fly an airline that earns points in the scheme. Isn't the point of status to take advantage of the benefits and if you book on a non partner airline you're not using the benefits?