Something similar is already possible with splitter. You can create an
*.osm file with many polygons inside, each with tags name=* and mapid=*
(see attachment). splitter will give you tiles with 6234xxxx and per
polygon a <name>.args with list of necessary data tiles per map. That
args-file you can hand over to mkgmap for creating the map. It's pretty
useful if you create many maps at one time. Gerd coded it a while ago
for my usecase, but as far as I remember it's not documented.
But if your map areas are overlapping you will get some very small ones,
which looks strange. But of course that's just a optical issue and of
course depending on the overlapping.
As I'm using this approach, I haven't thought about let mkgmap calculate
a smaller map, as I just would have add another polygon to my osm-file
in that case.
Henning
<?xml version='1.0' encoding='UTF-8'?>
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<nd ref='-39412' />
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<nd ref='-39246' />
<nd ref='-39414' />
<nd ref='-39390' />
<tag k='mapid' v='10100000' />
<tag k='name' v='CentralAsia' />
</way>
<way id='-39502' action='modify'>
<nd ref='-39420' />
<nd ref='-39422' />
<nd ref='-39428' />
<nd ref='-39446' />
<nd ref='-39448' />
<nd ref='-39418' />
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<nd ref='-39424' />
<nd ref='-39444' />
<nd ref='-39442' />
<nd ref='-39426' />
<nd ref='-39420' />
<tag k='mapid' v='10090000' />
<tag k='name' v='Poland-Czech' />
</way>
<way id='-39504' action='modify'>
<nd ref='-39450' />
<nd ref='-39464' />
<nd ref='-42732' />
<nd ref='-39462' />
<nd ref='-39458' />
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<nd ref='-39452' />
<nd ref='-39450' />
<tag k='mapid' v='10110000' />
<tag k='name' v='Alps' />
</way>
</osm>
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