Flash DROD uses Shift instead of Ctrl for the battle key. We do not use Ctrl, because Ctrl+Q and Ctrl+W are two shortcuts you do not want your browser to catch while playing.
Pressing numpad keys with shift is the same as hitting Page Up, Page Down, Home, End and the others - I can't catch it as Numpad, and if you had something mapped to them, they would yield strange things. That's why you can't map anything to numpad and Home keys.
Now, I can agree that there isn't much point in disallowing Numpad 0 and few others. I'll change it. I could try to make it do some smart detection, but it would still lead to problems (if you had something mapped to Numpad 7 and something else to Home, I wouldn't be able to discern between Shift+Numpad 7 and Shift+Home
).
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