If during the flare the RRPM increases and does so at a rate that the uppper limit is judged likely to be exceeded then a short sharp correction [control] by application of collective can be used to prevent the upper limit from being exceeded. However by carrying out this corrective action and following removal of the collective correction, the resultant RRPM will settle at a lower value than it was at prior to the flare being initiated. Lower RRPM is not desireable so how about use of secondry effect of cyclic control [push forward to achieve a higher ROD and fWD speed] ? Whaddayathink? Of course this is only a viable option at altitude.