Multilanguage website with language subdomain

Hey,

Our website uses subdomains to detect the active language.
Boost caches and serves everything great.
My only problem is when we want to flush manually all the cache files, or when the cron should clear some cache, then it's only flush the cache of the active language subdomain (which is usually the default language, English).
I guess it because the boost_transform_url function returns the active hostname (in hook_cron and hook_flush_caches). What I think it should do is looping all over the hosts defined as the URLs in the languages settings.
I can implement it quite easily but I wanted to check if there is a solution for that already.

Cheers,
Bnaya