Currently the zoom widget only allows for up to 400% zooming and zoom by mouse
too doesn't go more than 400%.  I suspect there may be memory problems with
going further as it eats a LOT of memory at 400%, but I really appreciate
infinite zoomiing.  Ive got a document which is pretty small but I need to zoom
in to see some details.  I'm talking about 1000% zoom or more.  Eog does that
for example.  I know evince is different, but it's still useful.  Otherwise, I'm
stuck.  I've got a document, with vector graphics which is zoomable by
definition, but I cannot see the details.

BTW, zooming by mouse does not change the zoom widget, so you can get to 400%
and it still writes 50% there.