Doesn't the B777 have main gear with features similar to the B52?
No it doesn't. As I remember the aft pair of wheels on the main wheel bogies of the 777 are 'steerable', rather like the 'body gear' is on a 747. You cannot align the main gear with the rwy C/L in a xwind as I understand you can do on a B52.
Regards
Exeng