Bridge lazy start type/ relationship between Threshold, idle_timeout and Message Expiry Interval

[RidhaSoua]

Hello,
Mosquitto defines the Lazy start type for the bridge (broker-to-broker communication).
For this Lazy start type, Mosquitto defines the threshold and idle_timeout parameters.
Threshold is the number of messages that need to be queued for a bridge with lazy start type to be restarted. Let’s assume that Threshold is equal to X. Now imagine that we don’t succeed to have the X messages in the queue of the first broker of the bridge (Messages are published in small rate). After an idle_Timeout, the two brokers are disconnected.
Q1: Is there anyway to make this threshold adaptive ? or to make it depends on a timer ?

Q2: Given that messages queued in the first broker have Message Expiry Interval (or TTL), how these parameters (Threshold, Idle_Timeout) work together with the "Message Expiry Interval" of the MQTT messages ?
Because if we wait for a long time before sending messages queued at the first broker of the bridge, these messages do not have any relevance, they become outdated.

Thanks in advance !