Thanks for the responses @richgalloway and @gcusello. I have tested this by changing the proxy setting for one of the applications rather than disabling the app completely. Thanks for highlighting the risk involved if this member is elected as captain and a resync will change proxy settings at all the servers but we have decided to go for "not preferred captain" option for that member (we acknowledge that the cluster attempts to respect the captaincy preference but it doesn't enforce this option). And if a resync from captain with different configuration is pushed we will script it to be overwritten with what's default of this member. We will test it further with some scenarios and update if it helps to achieve what we were trying.
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