Allow Multiple Login URLs with SSO protocol

We are currently using the Token method for SSO for our users, which only allows for one "Login URL". However, we will soon have multiple domains within our product that users will be coming to our Community and we need to be able to add multiple Login URLs so that users from both places are able to SSO in.   I was told by the Gainsight engineering team that their SSO settings only support a single login URL for each protocol .  It would be great if SSO setting could support multiple login URL’s for each protocol.