Having to Reboot your N900 after changing Themes.... Is it really necesarry?

I mean... Seriously?? Rebooting drains the battery and takes time...

Surely theres a quicker way to fully apply a new theme without rebooting the whole device.......?????

I am a mere power-user; not a developer, so I am asking the expert developers of this community - IS THERE A WAY?

Thanks!