On Wed, Apr 29, 2009 at 10:57 PM, bulia byak <buliabyak@gmail.com> wrote:
What is the purpose of this checkbox in LPE parameters? Does it work
at all? I tried it with Knot, but checking it does not remove the knot
on the intersection.

I propose to remove it because it does not seem to serve a useful
function, and because it uses the absolutely technical term
"knotholder" which users have no idea about.
Indeed, I was noticing the same recently. I'm not a native speaker, but this word doesn't seam to be very meaningful.
I was also wondering about the "Visible" checkbox in the effect parameter. Isn't it useless considering there is an eye icon in the effect stack ? To my mind it unnecessarily adds something that is not a parameter into the parameter list.