There should be a 'set chanmodes'.
set chanmodes "modes1,modes2,modes3,modes4"
This tells eggdrop what modes are supported by a server.
The first set of modes are modes that can take a parameter, but if no parameter is listed, it displays a list of modes of that type (such as 'bIe').
The second set of modes require a parameter when both set and unset (such as 'k').
The third set of modes only take a parameter when set (such as 'l').
The fourth set of modes are modes that will not take any parameters when setting and unsetting them.