As far as now in Plesk 17.8.9 Beta there are just limited options to configurate Nginx Mircocache.

There is no option to Cache every time.
Even if you de-select all of the "Bypass cache when" Rules your file looks like that.

/var/www/vhosts/system/domain.tld/conf/nginx.conf

[...]
proxynocache $nocache;
proxycachebypass $nocache;
[...]

But I want Microcache to Cache even if nocache is set.
Also these values are not configurable:

For Microcache

proxycachevalid
proxycachebackgroundupdate
proxycacheignoreheaders
proxycachebuffersize
proxycachebuffers
proxycachebusybufferssize
proxycachetempfilewritesize
proxycachereadtimeout
proxycachelock
proxycachemethods
proxycacherevalidate
proxycacheminuses
proxyhttpversion
proxysetheader

I would love to have some more options to fully configurate Microcache.

Thanks in advance and best regards,
Martin