Davis consoles have a Re-transmit function.
As far as I am aware, the new 6313 console does not have a retransmit option and I think this console is what the OP may be talking about here. Not sure why retransmit is missing - not aware that there is any hardware reason but maybe it is a feature that didn't make the cut for the initial WLC code, but may appear later?
In general, my view is that the repeater is best avoided if possible. While the repeater can work well, it's not always the easiest of devices to configure or to troubleshoot as and when there are any reception issues. Of course there are circumstances where a repeater is the only viable option.
My solution would be first to see if there is any way of relocating WLL or transmitters to achieve an RSSI of -85 or better (ie less negative). Once you get to -90 or so then reception is marginal and the signal is more vulnerable to dropouts under adverse reception conditions even if the reception % looks OK. Remember reception is only reported to the nearest integer and so even 98-99% doesn't rule out signal dropout for eg a couple of minutes.