So far, custom ROMs for so-called Gen 2 devices like the HTC Titan and Radar are nonexistent. This has to do with changes to the bootloader which has proved to be a difficult beast to unlock and therefore, reflash a new ROM onto. As a result, devices like the HD7 and even the HD2 are getting some of the latest, cutting edge OS builds while Gen 2 devices are left waiting with official releases.
That may (we stress, may) all be changing as the Dark Forces Team (DFT) are reportedly working on getting those custom ROMs for the Titan and Radar, or so says Cotulla (@CotullaCode) who recently tweeted "DFT team is working under ability to flash custom ROMs for Omegenka and Titanchik"
Nothing else was revealed like an ETA or progress of such a project, but honestly what more can we ask other than those fine DFT folks at least try to work on this? DFT has made a lot of headway in making custom ROMs for Windows Phones in the past (and even for Samsung devices), so if any group can do this, it'll be them.
We'll keep you posted if and when any developments occur.