Write new post > Drag / Click to set marker in location map

Is there an easy way to make the location map on the Write New Post screen clickable to set the marker or let the user drag the marker to adjust the position, rather than having to search by a street address/location?

We are preparing a blog for people that travel off the beaten path so roads or nearby towns aren't always an option.

I can see there is a div class="locationmap" which is set to display:none however the marker is not interactive. I'm assuming that the location.js handles all of the smarts behind the location services. Any suggestions on making the markers interactive?

Thanks