no, but you can zoom very fast to 400% with cltr-mouse-wheel or by pressing +...
adding a setting for this should not be too hard, but i wonder if there is a real need for it...
(on top of it, i guess that instead of a default zoom level, it would be more useful to have a setting to ask scribus to scroll to same position and zoom level... but, again, i fear that this is one of those feature that you find really cool when they are not there and you put them on a wish-list, but are more meh when you need to use them)