I'd vote for no. If you can't have same binary and check for cpu at runtime directly in mplayer then I'd keep one package per device. Maybe you can split package to two (mplayer-770, mplayer-800 or something like that) so you are not offered n800 version in application manager when doing package upgrade in 2007HE. Also maybe section 'installation' at http://mplayer.garage.maemo.org/ could mention n770 vs n800 choice.