Filerting collisions

I'm working on something that will be worn as an attachment, and I would only like to handle collisions with other avatars. Is there any way to do this other than:

collision_start(integer num_detected)
{
    if (llDetectedType(0) != AGENT)
    {
        return;
    }

    // Do my stuff
}

?

It appears that if you're walking on anything other than land, you generate collisions with every step, so the handler ends up getting called a lot. llCollisionFilter seems to only work for specific objects, not a type of object. What would be ideal would be something similar to the parameter in llSensor(), but I'm not sure if anything like that exists for collisions?

Thanks,
Ziggy

Edited to fix typo in title. Though it looks like it only changes the post title, not the thread title

Sadly, the answer is no. The code you've got there is the only way to do it... I've wished for this before. The good news is, I think it's probably less of an impact than you think it is.

Thanks.