Currently on the top half of the post screen:

if you press tab to go to the next field, focus is moved left to right, top to bottom. This means that if you fill out the popup buttons, then go to the version text field, fill it out, and press tab, you end up back on the classification popup.

Instead of this order we may want to change it to top to bottom left to right, so in the case above you would instead tab to the configuration text field.