I have noticed many stations using 2300Hz mode for calling CQ. For keyboard chats 2300Hz is way overkill and takes up three 500Hz slots in the passband. Is 2300Hz really needed for chats? Of course for file transfer 2300 will be quicker, but again you will be potentially QRM'ing more than one 500Hz QSO.
So maybe we need to establish some QSY freqs to use 2300Hz so as not to QRM other VarAC 500Hz users??