In mongo_client.js, line 212, it loops through the servers and sets up the socket options. According to the docs we are supposed to be able to customize these socket options, but in this case they are just flat out hardcoded. The result of this is when I boot up a connection, it will wait the full 30s to wait to connect to each replica member even if I only want it to wait say 500ms. I'm not intimately familiar with the code base, but shouldn't it merge in the results from object.rs_options or object.mongos_options and use those for initiating the connection to the servers?

var _server_options = {
poolSize:1
, socketOptions:

, auto_reconnect:false};