I setup a custom sign in page and figured out how to have this page show up as the login page by default for my SharePoint URL.
Basically I used one of my web servers to redirect a friendly URL to this URL. I inserted the bold part of the URL into the URL that I was redirected to when entering my sharepoint.com address.
https://login.microsoftonline.com/login.srf?wa=wsignin1%2E0&rpsnv=4&ct=1441166620&rver=6%2E1%2E6206%2E0&wp=MBI&wreply=https%3A%2F%2Fpflld%2Esharepoint%2Ecom%2F%5Fforms%2Fdefault%2Easpx%3Fapr%3D1&whr=pathfinderlld.com&lc=1033&id=500046#
My question is does this URL string ever change? Since I redirect to it, if it ever changes then my redirect could fail.