I think your terminology is a bit mixed up here. You are not truly "clipped" into toe clips / straps unless you are using cage pedals and shoes with slotted cleats, and have pulled the straps tight to lock the cleat into the pedal. In such a case "unclipping" is far more involved, especially on a FG, than doing so with clipless pedals and shoes. If you are using regular shoes with toe clips and straps, then you are never truly "clipped" in, and can always pull your foot out if you pull your foot back hard enough. Unfortunately, this also limits your ability to climb out of the saddle or backpedal / skid. All but one of my FG / track bikes have clipless pedals, either road or mtb, and the one bike that does not has bmx platform pedals and wide soft straps w/o and clips for riding with soft soled shoes, and it is geared very low, since I can't pull back w/o my feet coming out. I use SPD clipless pedals on my mtb and cross bikes, where I have to frequently dismount and remount the bike, and getting into and out of the pedals is a no brainer, much much easier than with clips / straps, which I stopped using decades ago.