I re-checked and it does, the Mach Dash Speed without Hyper Dash is 2112 and with Hyper Dash is 2640.
I remember now. In vanilla, Mach Dash speed is a multiple of your base dash speed, which changes when Hyper Dash is on. So, indirectly, it is affected, even if the modification is not part of the Mach Dash code, as I recalled. However, I rewrote it so the speed for Mach Dash is set completely independant of the normal dash, and I guess I forgot to add a value modification for Hyper Dash to it. Oops.
Let's list it as "known issues" for now, as it's not a trivial thing to fix. I'll need to relocate and expand the relevant subroutine yet again. Not sure when I'll be able to tackle it, but I guess a slider to control how much is added, as you suggested, will have to be added to the patcher when it's done.
Thanks for bringing it to my attenttion
So the main feature I and others would most be interested in is a a way to warp to the last nearest checkpoint (mid stage) with some button combo. or a combo to just die on command would work too since there already an infinite lives option.
Thanks for testing, and I'm glad you're enjoying it!
The die on command thing is already possible through GameSharks, so by mixing it with an infinite lives code (either by Tweaks or through a different Gameshark), you already have what you need:
Press Select For Suicide by Dybbles
Pro Action Replay/GameShark
Same goes for level selection and what not. Check here for more: https://gamehacking.org/game/89276