Query restriction in Goolge App Engine

Inequality Filters Are Allowed On One Property Only
I have an idea of web site that'll use plane with coordinates. So restriction above don't allow to query with two different param "between" conditions.

It's so pity. :(

Downloadable docs for google app engine

http://googleappengine.googlecode.com/files/google-appengine-docs-20080816.zip