some questions about downloading maps

Hi all

I am trying to download maps for offline use through the Oruxmaps map creator. It's working quite well thoughthough I am facing some minor problems. Would appreciate your help on those issues:

1. There is a limit of a 512MB download for one map. IsIs it possible to download bigger maps than than?

2. Sometimes Iwish to download two different maps (let's say Google Earth & Google Hybrid) of exactly the same area. Is there a way of doing that?

3. How can I change the name of a map after it was already downloaded?

Thank you for the help
Erap