HI!
Now the code is on Inkscape 0.91+devel.
0.91+devel is the development version heading towards the future 0.92 (not released yet).

Info about 0.92 release
http://wiki.inkscape.org/wiki/index.php/Release_notes/0.92

Get it
https://inkscape.org/en/download/#download-devel
Compile it
https://code.launchpad.net/~inkscape.dev/inkscape/trunk

Most of work be done for the autors of LPE lattice-1-
Johan Engelen, Steren Giannini, Noé Falzon and Victor Navez

The video is a little outdated, now works better smooth/fast.

would'nt it be more handy if coordinates were in % of bounding box rather than absolute coordinates ?

Thanks for your feedback vince.
I want to supress the points parameters, but suv tell to me is better dont supress, its sometimes could be useful for tecnical o programaticaly generation, and for this case maybe absolute is better. Not sure. For artistic works i think the numeric point positions usualy be ignored and the draw is modified by his knots. Its a open discussion.
Regards, Jabier.

it lacks presets (but it's a more general problem and not specific to your LPE)

Yes, could be done at start with fixed positions, maybe in the future, custom ones... For my effect isnt vital but for powerstroke could be very useful. Im very busy but take note for the future. Thanks!

presets could be like those

http://0.tqn.com/d/graphicssoft/1/5/c/-/PSCS2-warp1.gif

Thanks for the pic. Maybe in the future...

now on 0.92