And I agree that G.rev's game should be referred to as Senko no Ronde in English, because that's how G.rev themselves decided to transliterate it. But until I see Success calling their game Itsuwari no Ronde, I don't see why I shouldn't just follow the katakana reading as normal.
Because _I_ didn't follow it is not a good enough reason? ... OK, I'll go. Grev's game shouldn't be referred to as "Senko no Ronde" "because that's how Grev themselves decided to transliterate it", Grev's game title should have the word "Ronde" because that's indeed _the only_ way to "transliterate" it, much like, say, "Dynamite Deka" is the only way to romanize the name of this Sega's arcade game, for instance.
In order to be really accurate, we're not "transliterating" from Japanese to roman alphabet, it's Grev the ones who translitered the word from French to Japanese. They just used an odd way to do it (not so odd these days, actually, especially in these media) - by using kanji instead of katakana (yeah, even if that kanji originally isn't read "rondo" at all, but the nature of the Japanese language allows this kind of licences; you "can" invent any kanji's pronounciation to some extent). So we're just taking the original word in its original alphabet, much like when we write "Dynamite" for "Dynamite Deka".
Such is exactly the case of "Itsuware no Ronde". It's true; we haven't seen it in official documents yet, but we once again have two hints thanks to the furigana for "rinbukyoku" (the kanji used for that part of the title). Firstly, it's in katakana and it is not a possible (orthodox) reading for that kanji, so we only can have here another of those puns with foreing words the Japanese love. The two only (reasonable) possibilities for that katakana form are either, the Italian "rondo" and the French "ronde" (we could even consider the Spanish "rondo" (= "bull ring") or even the English "ronde" (= "script with a round look for its characters"), but, as I said, let's just take the reasonable options). These "puns" happen to involve indeed playing with semantics; the kanji's meaning usually has a similar meaning to the foreign word. That leaves only one choice here if you care to translate; "rinbukyoku" means "dance in circles", which is exactly what a "ronde" is, unlike an Italian "rondo".