I think the enable_touch only makes to detect the model with the mouse possible and the untouchable makes it possible to detect entities behind this model. If you only set the enable_touch flag to off then you can't detect entities behind it.
This would make sense.

Yes. All entities are mouse-detectable unless their UNTOUCHABLE flag is set. However, you can do this by assigning a simple action

action set_untouchable()
{
my.UNTOUCHABLE = ON;
my.DYNAMIC = OFF;
}

Thanks, that makes a little more sense then.
cheers
tindust