It turns out that the restriction on logging in to a server more than once is a known issue and a problem with Lightning (the CalDAV extension) which is used for authentication, not with Sogo Connector.
A pity that the docs for neither Sogo Connector nor Baikal (nor any Google search I did) turned up this fact. One solution suggested by Sogo support is to hack one's hostnames file to sent Sogo to the same destination using different network addresses.
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