Certainly is possible mate, open your mIRC script editor. (Alt + R) and press File > New if the page isn't blank for a fresh new page.

Paste in the following and click "Ok".
Code:
On *:Start: {
  server server.one.address
  server -m server.two.address
  server -m server.three.address
  server -m server.four.address
}


Hope this helps, good luck. smile