Frequency in spectrograms is pixelated at their detail zoom. The only way to get a smoother frequency scale currently is zero-pad, but that only adds to the window size making it slower. Instead of nearest neighbor, how about bilinear or cosine (the one that you implemented on equalizer)?
You have already made your views about frequency scales clear. Please do not repost your feature requests multiple times. We read your comments the first time, and repetition is only a waste of our time and your time.