last I checked there were significant changes between ratbox and hybrid protocol... one being TS6 and the other not so i find it unlikely the ratbox protocol working for hybrid.. so the answer is probably "no"..
ircd support is not a high priority of the dev branch at the moment.. the more are supported, the more need to be maintained whenever the core is changed. the less common ircd's (that are still maintained) may get support modules when the API stabilizes, closer towards the end of the dev track. for testing purposes it sufffices for 1.9 to have a protocol module for an ircd that uses a specific part of the cores API (eg: at least one must use the TS6 functionality)..