Great to see it is ready but I have a couple of questions.
Your documentation says you can configure how you want so you could use Towns, Villages & Burroughs as your hierarchy rather than continent, county, city! Am I right you start with the Default Continent - Country - County - City and then add sub-regions like Town (Child of City), Burrough (Child of Town) etc. going as many levels deep as you want? Or do you rename the original Continent - Country - County - City to your desired heirarchy keeping it just four levels deep?
This leads to the front-end filter where the question is whether the labels - Country - State - City etc. are customisable because not every country has States for instance and if you are doing a local listing database Continent and Country are probably redundant and the States, Cities should be labelled according to the country or region your website is targeting. For example if I am doing a Buisness Listing Database for Middlesex in the UK there will be cities, towns (not part of cities) and villages so my users would only want to type in a Town or City (cities possibly broken down to North South, East, West & Central areas) or village.
I would imagine I would organise that by having all the County split into areas North, South, East & West Middlesex, then cities with the large ones split into areas and the towns & villages all on the same hierarchical level. When customers click on the front-end dropdown this will have to be labelled logically so it might have the County section labelled County Area with the four areas listed, then City/Town/Village as the second dropdown.
Hence the front-end screen needs to be customisable. Sorry to have been so long-winded.