What sort of sense would that make? Distributing entire roms is necessary (or rather, very helpful) on Android because it's structured as a base system + apks, with app management only applying to the apks.

Maemo, like Debian, has the entire system controlled by dpkg and apt, and all the tools you need to replace arbitrary components with your own version are literally in the palm of your hand. Flashing a whole rom just seems like a long-about way to annoy yourself. You could do it as penance for using an iPhone, I guess.