Have any manufacturers played around with the idea of scopes with both FFP and SFP reticles? I love the idea of having a SFP reticle for the cross bars and center dot and an FFP reticle with hash marks, preferably .2m hash marks and some "open" version of the christmas tree. Attached is an expert artists' rendering. Curious to hear why this doesn't work, cost? mechanics? one of the million other considerations I don't understand?