My Performer Highracer came with MTB shifters and a Road Derailleur and Road Triple up front and a MTB Cassette and MTB Derailleur in back. As I always understood it, Road and MTB pull ratios are the same in front. The proof of that, I think, is that it works at all. There isn't any 'sort of'. If the pull ratio's differed by any amount you would not be able to use MTB shifters with Road front derailleurs. What is variable is the presence of a 'trim' function in the shifter to avoid chain rub. Some have it. Some don't. A trimmable shifter will have index positions that incrementally move the derailleur to accommodate the chain angle as it covers the span of the cassette. Chain rub is not usually acute on something like a Canto. Sometimes a sliding idler can help with chain angle.