Kerrigan's Psionic Shift (Psi Strike) from swarm uses a scaled quad, but no guide region.
Looking through storm game data makes me think this functionality is impossible without Quad Regions from storm (as utilized by Alarak's Deadly Charge).
I've linked the data I'm using for my stretch line quad--though the working part of my region (fixed length) using seemingly the same game data, does not work at all on this sample map. Not sure why, and I don't have the time to debug it :/
Problem is the cursor location is fidgety enough as it is. With my artillery demo map even getting a model to follow the cursor was a technical challenge. A hacky work around would be a pantograph of Model actors between the cursor point and the caster using small quad regions with queries between the two points.
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<RegionFlags index="UseEffectRange" value="0"/> causes the quad's launch site to originate at current mouse position rather than caster position. This does not appear to change how the region behaves (ie region still does not scale with quad).
Alright, I've almost got it working by creating rectangle regions attached to each quad segment actor. It appears to work for the initial quad creation, but fails on subsequent quad segment creation/destruction.