Yep this has been suggested a number of times already. I'm curious in what way you're envisioning this though - do you mean just doing it to "edit" a kick, or to change the pitch in real-time, like when you're playing different midi notes?
Viewing post in Pitch punch and tail separately
Both would be great. Real-time is useful if you want to create kick rolls like in hardstyle, but for editing, you can simply adjust the punch to match the pitch of the tail so that they sound good together. Like to have the option to pitch only the punch, only the tail or pitch everything.
Hopefully, I’ll see an update with this feature, it would be really nice!