I posted once about this issue.
Basically I was wondering what did "WHEN TK FUEL RQRD" exactly means.
If you stay at high level to deaereate the fuel, the problem you have is that, although the total fuel on board is usable, an amount of it would have to be used on one engine only, as the wing with pumps on would deplete at some point before the pumpless wing.
This would be a problem only if the imbalance is high and the flight has to divert and/or use part of the final reserve.
So I guess that a way to handle this problem would be: to recalculate a minimum diversion fuel so that losing the pumps-on wing engine due to fuel starvation would not occur. If you estimate to have more than that on arrival, you can continue to destination. If you don't, you could still proceed, if a landing is assured and all that.