It should really be possible to use Fremantle Media Player in the portrait mode, at least when playing audio. A typical usage pattern would be to keep Fremantle device in your pocket while listening to music, then quickly take it out with one hand to browse through the list of tracks. Portrait mode has following advantages here:
1. You can easily hold the device with one hand (like Nokia 5800 and similar devices)
2. The portrait-oriented track list can show more tracks
3. As the device is already sitting vertically in your pocket, to let the headphone wire out, you do not need to rotate it.
Discussion thread at http://talk.maemo.org/showthread.php?p=354939