CSRF regenerate with AJAX

I'd suggest looking into the original security concept behind CSRF... I suspect accepting a request from any "used" token (when requesting the 2nd, 3rd, ... nth "fresh version" / new token) will compromise some of the original intent (and security) by breaking the singularity of the "active" thread between the client and the server which the CSRF tokens afford... though, perhaps it may still be good enough for some use-cases(?).