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Percona's "Priority connection scheduling" seems very useful ,will MariaDB consider import this feature?
This is in 10.2, albeit slightly different from Percona's . For transactional workloads should be on par or better. One of the features I that did not excite me in Percona's implementation is "low priority connection throttling", as this seems a little dangerous optimization with potential for deadlocks, so this is not there in MariaDB. I also think thread_pool_kickup_timer is more reliable mechanism to avoid stalling low priority threads as compared to Percona's "tickets".
This doesn't look like it's being considered at the moment. If it's something that interests you, I suggest adding it as a feature request on JIRA.