Many unity dialogs are unusable with a vertical resolution 576

I own a Dell Latitude 2100 with a screen resolution 1024x576. Its not a great netbook, but it is what I have at the moment.

Unity in general works well on it, however there are a number of system dialogs that are unusable because of the vertical resolution.

Here is a example, I want to write a review on software-center, so I click "Write your own review" link it brings up the review box which then loads the Ubuntu Single Sign On dialog. It promps me to register a new account with a "Set Up Account" button at the bottom. But I already have an account. I imagine that below that there is an "I already have an account" button - can someone with a "normal" resolution screen confirm this. But I cannot see this, I cannot shrink the size of the dialog, nor can I pull it up higher then the top bar. So the result is I cannot ever write a review!

So my qustion is, this is clearly a bug with the Single Sign On dialog, but it also occures in other places. Can I file one bug about all dialogs that are unusable at 576? Does Unity support this vertical resolution - I think it should. And can unity provide me with a way of using them - let me move them futher up the screen. As it is, I loose a number of pixles at the top with the status bar.