You can change the duration of the link expire time. When you go to devices overview page --> Go to DEVICE ACCESS table and press on the WebUI link, you can generate new token with your specified period of time.
RMS now allows to reach devices behind the added router via HTTP protocol. To configure such token go to overview page --> actions --> access. There you can create a new rule depending on your topology and ports used.
More protocols (other than HTTP) are at the implementations list already