OK, I'm no developer but if I take a look at your screenshots I think you're really missing something:

The view in QT Developer seems not to be "hildnzied" wich means for me: 1) it doesn't use the Maemo system-font
2) if you take a good look at the 2 buttons: both are alined left BUT in with different corners (90 degree in first, roundet corner in the second) With a little eye.judgement I'd say that if you cut the roundet corners the boxes would be the same size.

I would'nt say that this would be a big problem with more complex UIs, just make the buttons a littlebit shorter to compensate for the roundet corners in hildon

Just my 2 cent,

Glasswalker