As far as I can see, the pppoe assumes dynamic address allocation. There is a box to tick for g/w and that will give you the ISP's g/w. The gateway will eventually show up in the dashboard interface details. Also a similar box exists in the DNS settings, but doesn't show any thing.
Ian M
Werner,
you have raised an interesting point about the use of static IP addressing while using PPPoE. As far as I have experimented you would have to use PPPoA to assign a static address and other static type information, at least in this beta version. Might change in the next beta release.
Ian M