I feel your pain.
Hoping they may do this on iPad2 but to be honest it's such a simple and tiny option to add under settings that if they didn't want to do it for the long awaited 4.2 update we waited months for, then I'm not holding out much hope they will give us the choice.
I will still keep my fingers crossed as everyone who uses a different more advanced browser would want this option.
Apparently it's been submitted to Apple as a request quite heavily and also requested by the devs of the alternate browsers.
Fingers Crossed.