Increasing number of threads in 4.5 version

Couchbase Server
1

Hi,
I have several questions and would be grateful if anyone can help with them.

  1. Really only possible to reduce the number of threads as specified in the manual?
    https://developer.couchbase.com/documentation/server/4.5/cli/cbepctl/set-flush_param.html#story-h2-4

  2. Сan I increase number of memcached threads which spawned on start? How determined this number on start?

  3. Will be changes committed at once, If I decrease number of writing threads via cbepctl?

Thanks.