Log on and play

[grenadier]

Hmm interesting but I did not intend an email log in.  But a unique key given to registered players.
[...]
What I ask is a relevent question and in truth all I ask is could it be implemented, or could it be considered.

Dev version already supports "unique key" feature, you can check the "next" branch to see, how it will look: https://github.com/assaultcube/AC/tree/next (nowadays the keys aren't stored or managed remotely by MS).