Enable/Disable Slave Latency using nRF Connect SDK

There was a previous discussion about the option to disable/enable slave latency a few years ago:  Enable/Disable Slave Latency using nRF Connect SDK + Zephyr BT Stack on nRF52840 

Did this ever get implemented? Specifically interested in the feature when dealing with SMP/mcumgr, reducing latency while transferring larger amounts of data and then re-enabling slave latency when the transfer is complete. Renegotiating connection parameters takes a very long time when the slave latency is high, and thus the user might have to wait unnecessarily long before a data transfer can start.

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