Hi, Offray!
For the present, one has to use *nested* Test Boxes to achieve the
effect of the "ands" and "ors" you want.
Thus, where you want, for example
TEST ((elmer's x < 5) and (elmer's y < 5))
YES elmer make sound croak
this could be constructed as:
TEST elmer's x < 5
YES TEST elmer's y < 5
YES elmer make sound croak
or (to explicate my shorthand):