Is this something I can do myself? I'm OK with hacking core code. In fact the site is quite significantly hacked, not just for Easyblog, but also JomSocial, and everything is documented so that I can manage upgrades, so if it's possible to just tell me what code to change and where, that would be my preference (though I certainly appreciate the offer).
I've just returned to this subject and it seems that in v3.5.12286 of easyblog the locations where the map type parameter is now set is media/com_easyblog/scripts/location.js.
There is also a media/com_easyblog/scripts_/location.js (note the underscore at the end of the scripts folder), which also appears to set the map type, but changing ROADMAP to SATELLITE here does not seem to have any effect.
My problem now is that I want to set the map type by individual map type. Large area maps are better displayed as roadmaps, but inside a town satellite maps are way better.