Found this in the release notes. Great idea and huge time saver:
Preset name functionality in the Store menu has been changed as follows:
X: Insert a character at the current cursor position.
Y: Delete the character at the current cursor position.
A: Select an upper-case character.
B: Select a lower-case character.
C: Select a number.
D: Move the cursor.
< >: Move the cursor.
Value: Select any character from the character set.
This behavior is also extended to the IR Capture utility.