In the case you get admission, does anyone know if it's feasible to request an extension on the time limit to consider the offer?Any experience on that??

thanx a lot

I do not have experience on this matter but, above all, you have to be honest. You should e-mail the university and explain your situation (maybe they will ask you to cite the universities you are waiting for) asking if they can grant you an extension. That is what I would do.