From the A6 manual:
quote:

max_ph_entites
Determines the number of entities that can be registered for physics.

Type:
Variable, read/only.

Range:
0 - no physics engine available (S E)
1 - physics for 1 object (C)
999999 - unlimited physics (P)

CAPS_PHYSICS
Defined if the engine is capable of physics (C P).
By checking for these values it's possible to avoid obscure error messages if a user does not have the required engine version..

@Ventilator:
Got your e-mail and I will be looking into it.