From my old Kernel docs and from "Mastering Windows XP Registry" (same values) =>
AutoRepeatDelay This entry has a default value of 1000, or one second. Increasing this value
increases the wait time before the keyboard auto-repeat kicks in.
AutoRepeatRate This entry has a default value of 500. Increasing this value increases the
repeat rate.
BounceTime This entry has a default value of 0. This value specifies the amount of time to
ignore a keystroke after pressing and releasing a key. This helps eliminate false double
keystrokes.
DelayBeforeAcceptance This entry has a default value of 1000. Increasing it increases the
amount of time that a key must be pressed before it registers as being pressed. Changing the
default here is useful if a user has a tendency to hit keys by mistake.