i do loving XNVIEWMP, i wish new feature: add new sidebar like as lightroom:
first place: Histogram
second place: WB, bottom: Temp, Tint
third place: exposure, contrast, highlights, shadows, whites, blacks,
forth place: vibrance, saturation
five place: curve line
all this things (xnviewmp has this parameter) so idea will be all parameter in one sidebar.. this is good idea for many users love lightroom "sidebar", instead now xnviewmp has parameter but used many "dialog/window" i don't like it.. so sidebar is faster direct parameter nothing opening many times window/window/..