If a split-brain happen and PH is enabled it would be worth in some use-cases that the complete cache becomes read-only instead of having some keys (DIST) or a complete instance (REPL) unavailable.

so a configuration like
<partitionHandling enabled="true" read-only="true" />
where read-only=false is the default to have the same behaviour as before might cover such cases.

It seems to be worth for DIST and REPL caches.