On TCP side, it is possible to modify the min/max RTO by either setting the corresponding sysctl, via BPF and the socket options. See this from the docs
Minimal TCP retransmission timeout (in microseconds). Note that the rto_min route option has the highest precedence for configuring this setting, followed by the TCP_BPF_RTO_MIN and TCP_RTO_MIN_US socket options, followed by this tcp_rto_min_us sysctl.
On MPTCP side, TCP_RTO_MIN and TCP_RTO_MAX are still used in some places. Not all of them needs to be changed (e.g. the default value for the ADD_ADDR max RTO time one).
On TCP side, it is possible to modify the min/max RTO by either setting the corresponding sysctl, via BPF and the socket options. See this from the docs
On MPTCP side,
TCP_RTO_MINandTCP_RTO_MAXare still used in some places. Not all of them needs to be changed (e.g. the default value for the ADD_ADDR max RTO time one).