When you need to select a midpoint of an edge or a segment, you have to right-click on it and then select midpoint!
I try without success to put a keyboard shortcut on this "pseudo-function" like I click on the segment and then by pressing the "A" key SW automatically selects the midpoint of this sequence!
Does it speak to anyone? (I specify that in the keyboard shortcuts proposed the 2 "Midpoint" have nothing to do with what I am trying to do!
Sorry I'm going to talk without helping you, I didn't even know that you could or couldn't do this kind of manipulation with solidworks, I'll follow your question more closely.
I click on Sketch, I select the face where I'm drawing, and by pressing my shortcut, the line only snaps to the midpoint of the segements. When I press the shortcut again, the function turns off.
Personally, when I was doing plays like the ones mentioned, I proceeded in the same way.
Be careful, follow carefully. :)
Since my parts were subcontracted (so no way to know the loss at the fold) I did that, and I still provided the flow by specifying the dimension of the fold (I didn't completely side my part, I took on myself a method part).
So, for a sheet metal with 2 plies for a U-shaped finish, I made sure a minimum dimension of the inside of my U, but my design was such that it had no influence on the result: if the radius was as drawn (tight), my real U corresponded to my CAD U, and if the radius was larger, my U was wider!