I'm not sure about ICMP redirects, but I wouldn't be surprised if they are ignored.
They are not ignored.
Finally, static routes in the normal sense aren't really supported. The static routes which are added as a side-effect of defining interfaces are there, but not an explictly defined static route via an arbitrary router. You can define a default route, but it's not quite static -- if there's also an /etc/dgateways file, the router may chance the "static" default route to something else listed in that file, depending on info gleaned from RIP.
Static routes can be added via the 'route' command.