Enhancements
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Button to "maximize" selection to fill paper's aspect ratio.

Add some help for choosing paper size for meaningful output.

Bugs
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"historic=*" will need some icons

highway=pedestrian should we wider. Check e.g. Olaf Palme sétány in Városliget Budapest

When a node uses two stuff that is rendered, that is not handled. Example: 
 One node with: amenity=cafe + shop=books + gambling=lottery

In IE, the modify mode works only if Debugger is runnig!

IE9 does not add page break

Image width 2007px was calculated for A4 portrait paper, now 
different papers should use different values for 300 DPI result

Landuse fill could be an ON/OFF switch (e.g. BP XIII sucks but useful for town prints).

Railway and similar: node objects could be rendered, e.g. subway_entrance

Rossmannak nincs ikon
http://www.openstreetmap.org/?lat=46.248914&lon=20.146219&zoom=18&layers=M

More CAPTCHA: check disk size of OSM download dir and disable the whole system is reached a limit.
Empty that dir daily (cron).

(housenumbers)
When POI has icon + name + housenumber, move housenumber below icon?

Park, playground should be thick line only if has fence

amenity=doctors rendered with no "doctors" label

leisure=playground name= name not rendered?