Frank,
Thank you for your willingness to improve the map feature. Normally I would suggest your attend one of the ODK 2 developer calls that were happening twice a month. However, we have temporarily suspended the calls as a new TSC is scheduled to be appointed to shepherd ODK 2 that will probably lead to the changes in the meeting structure.
Feel free to post any specific questions you have now in this thread and hopefully we will resume developer or community calls soon.