Has anyone considered asking or actually asked their fertility specialist for twins
Its actually a bit harder than asking for it - I know quite a few IVF women who have had 2 embryos transfered - this does not guarantee a twin pregnancy, it doesn't even guarantee a pregnancy. Nothing with IVF is guaranteed.

Yes we had two embryos transfered - not because we specifically wanted twins - although this would obviously be a dream outcome, but because we wanted to achieve a pregnancy. This was our goal. We are lucky enough that our FS doesn't restrict us to only 1 transfered at a time, because our success of a singleton pregnancy, come from a transfer of 2 embryos.