Thank you! 
To make it right, the event can't be floating around the relays before all signatures have signed it. Otherwise it defeats the purpose, thinking about a companies blog or government announcement channel that needs checks and balances. So all signers either need to use the same computer, or the half signed event thats been send through relays has to be encrypted.  

 Also have a look at nsecBunker by @PABLOF7z . Not multisig but it allows for managed access/use of a Nostr key. A few clients have implemented support. 

https://nsecbunker.com