To some degree, whether or not this will work for you depends on what you were trying to do with it. I don't remember any discussions about it on the mod_perl list, which I think is largely due to CHECK and INIT being new and rarely used features. It may be worth a search though.

Making it work for both MP1 and MP2 would require you to check the version because the API is different. See this for the MP2 syntax.