OK, I see what you mean now.

I don't know if the gods would approve that and I learned not to invest in patches which will not be accepted.

But you can hack that for yourself.

If you right-click on [I've checked all of these] you'll be offered to investigate the button in the dev-console.

There you'll find a timestamp in pageloadtime which can be manipulated

<form method="post" action="?" enctype="multipart/form-data">
<span><input type="hidden" name="node_id" value="3628"></span>
<input type="hidden" name="pageloadtime" value="1709739362">
<input type="submit" name="viewedNewNodes" value="I've checked all of 
+these">
</form>
[download]

after substracting 86400*days I filled the new value in and hit the button.

To make it more comfortable, you can either write a bookmarklet with javascript: protocol or a nodelet-hack to do so.

HTH! :)