Proxy voting disabled for the time being...

I have just disabled proxy voting for new polls. Proxy voting only remains enabled on a very limited number of old polls still open today.

Proxy voting was a great feature of this web site. However, it suffered from important limitations, so much that I preferred disabling it for the time being.

Meanwhile, I'd like to start a dialogue with interested members as to which minimum features to have implemented before we can confidently re-enable this feature again. To that effect, I have just started a new poll.
What conditions must be met before proxy voting is enabled?