Pix: yes, S=217 is the maximum value you can have (for tx_integer =32 and non_combined BCCH)
the only thing that may make a difference here is that this setting also increase T3126 minimu value (which is the timer started by MS after last chan_req is sent . min T3126 = 2S+T =249 *4.62 = 1.15s which is only 6 ms longer than maximum time between retransmission and it can be up to 5s so there’s is probably no gain.
I agree with you that there’s nothing to do with this.