It could be seen as some kind of cheating, as some BD caves rely on precise, in-time zigzag style movement (some early intermission caves of the classic series, for example, if I remember right), which will be easier to play with "zigzag movement support". But I also do not care much about cheating, R'n'D has a lot of features that are effectively cheating (like pause mode, or single-step mode), and using these features will indeed be stored in the corresponding tape file (replay/demo file).
But I agree that this is a useful feature, and have now added it also to the BD and SP game engines in R'n'D!
And for those who don't like it, this feature can be disabled (for every game engine independently).
BTW: With the next R'n'D version, you will not only be able to disable "smooth movement" in the setup menu (already mentioned), but also "sticky keys" or (more general) "sticky movement input" (which is also used in the also synchronouos original EM game engine), although it should not make any difference when playing BD "in rhythm" (but may help a lot for beginner or even intermediate players who wonder why Rockford does not move after pressing and quickly releasing a direction key).and while we are here: thank you for RnD! sadly, i couldn't play it much due to two things: "async" nature and graphics. don't get me wrong, please: this is not your (or RnD) fault, it's my own brain. somwhere deep in my brain there is the hardwired thing: "anything that is not based on tile movement and doesn't look close enough to the original BD is a cheap replica. do not want!" of course, i know that RnD is not that (and it is based on EM, not on BD), but… i never played the original EM; i played DOS Supaplex, and was never hooked by it too, due to "smooth movement".
but i still playing RnD from time to time, because it is such a fun game!
