Is there a way to create a perfectly vertical or perfectly horizontal arrow in WireFrameSketcher? I can't figure out how to do this, it always comes out at a slight angle which looks very strange.
I agree this is a limitation. I created Arrows stencil that should help:
Let me know if this works for you.
Lila, arrows were improved in the latest release. It's now possible to draw straight horizontal and vertical arrows: http://wireframesketcher.com/blog/2013-02-04-improved-arrows-eclipse-foundation-membership.html