Weight range: -1.0 to 1.0
First of all yes. If using a skirt you are likely to get a pantyshot
Not sure if it will work on males due to me including a dubious tag
Tested mostly on standing, sitting and on_back. Saw it work on legs_up but in a more limited range. Haven't tested on split_legs or other more esoteric poses
The extremes are crossed legs and spread_legs with some supporting concepts. Seem to starts acting Iffy above +/-2.5 so that's on you and it might depend on the model
It does require the legs tags to use and you can use the common tags like spread_legs or legs_apart plus the leco for even finer control
LECOs are manipulated by their weight and normally need no triggers to use it (this one does), change their weight like this:
<-1> to make legs close or crossed
<1> to make the legs more spread
Remember you can go further than -1 or 1