Adobe Acrobat 7 Professional - Manual (Page 407)

Enabling single key accelerators
You can improve the functionality of your keyboard by using single key accelerators.
Most keyboard shortcuts in Acrobat don't require that you enable this option. (See
Keys
for selecting tools .)
To enable single key accelerators:
1. Choose Edit > Preferences (Windows) or Acrobat > Preferences (Mac OS).
2. Select General, and then select Use Single-Key Accelerators To Access Tools.