You'll probably find a lot of the answers here -> http://fragostech.com/MaemoMapper/

Saving maps to the internal memory card is done by going to Maps->Manage Repositories.... and selecting a different folder (e.g. your internal memory card) for the Cache DB.

I had that issue with flite too but can't remember how I solved it. stupid question but I presume you have the "Enable Voice Synthesis" option ticked in the Settings->Announce tab?