D-pad on Droid is worthless. If the arrow keys were more spaced on the N900 so that two keys can be pressed to emulate diagonals (or allow mapping for diagonals) the N900 keys would be fine for a no d-pad option (d-pad better though). Mapping would be the simple (logical) solution. Works OK on Droid, but N900 KB is better. The only keys that are arranged for decent multi key presses is the G1. N900 is too easy to hit the start key, based on current key mapping.

Using screen controls for diagonals and keyboard for other movement on old school games is not the best option for control. Mapping the keys is. Even Nokia in their infamous video that got Nintendo mad showed this as the recommended way