Why can’t I bind “shift” as a valid input? Why can’t I bind moving input on the mouse button?

[FatHaggard]

from the FAQ posted in 2014:

**Why can’t I bind “shift” as a valid input?**
Honestly we don't know how we didn’t noticed it before, but we will try to correct that in a next update.

**Why can’t I bind moving input on the mouse button?**
Honestly we don't know how we didn’t noticed it before, but we will try to correct that in a next update.

Did these never get added nearly a decade later?