Maybe that could be integrated into a simpler child-suited interface.
You might want to talk to the programmers of various children-specific-programs and maybe hire one as a freelancer for an interface-project only.
Here's some URLS:
Voted very good by "Öko Test" (german product-test-magazin):
http://www.affenterz.de/
Voted good:
http://www.modern-games.de/hauptseit...ite=detail/148
No voted but my cousin liked the games quite much:
http://www.kiddinx.de/portal/
Hope this helps.