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Following on from Kevin's 'no move bounce back request', please would you consider conditional moves. For example, in Five Line, your opponent may have to stop a four and you could say 'If (the square where he needs to put his piece), then ...' I appreciate that this would be horribly difficult but it would speed up games enormously.
(kaŝi) Se vi bezonas malnovan mesaĝon de elektita uzanto, klaku ties karakteristikon kaj uzu la ligilon "montri mesaĝojn de ĉitiu uzanto" supre en la paĝo. (konec) (Montri ĉiujn konsilojn)