RAX10 VPN client Options

Hey everyone! I have noticed that the only available VPN client option in all of the firmware revisions I have installed for service provider is PureVPN. Based on what I've analyzed, it seems to be connecting over a regular OpenVPN configuration. I'm not trying to discredit PureVPN (I have an account--that's how I was able to test.), but it would be nice if there was some other VPN options (even if it's just in the form of connection to my own server.) Has anyone found a way around this? Can you replace the configuration to have some other parameters set to connect to a different server, or has anyone been able to trick the firmware? I, along with many others, would love it if we could choose other options; this seems like a moderately simple feature to fix in the next firmware upgrade. If anyone has any information or knows anything, let us know. Thanks!