When using the Aux system I need to put in negative values in some of the properties (Gravity, Wind). I select 'options and enter a negative number (say -10) the input is accepted, but the the visual response is incorrect.
When I go back and check the options I find that the -10 has been replaced with '65535'. These properties can be made negative with the main particles...why not the aux system?
That's a limitation you cannot really circumvent. Somehow it never works the way one would expect. Another kink to iron out for a future release, I suppose. ;o) If it's an option (and not too much work) use a duplicate of your layer and animate this duplicate's main particle emission to look like Aux particles.