We always ask project manages at our company to leave feedback as comments in the individual frames in Boords. But sometimes they have to give ‘visual’ feedback and the fastest way is to simply do a rough sketch on top of something. Right now there is not way to sketch something in Boords without it becoming part of the frame itself. So what PMs end up doing then is either doing screen-caps of downloading the frames to do these sketches and then paste them in Basecamp for us designers/animator to see.
Would be super handy to have tool like the arrows, pencil, shapes, etc but for commenting only, which would not render when being exported but simply be available on Boords for the team working in it.