Disable CTRL + A shortcut in KeePass
Cornelius'answer from Aug 18 '10 is almost two years old.
Here is the solution for KeePass 2.21.
Go to Tools/Options/Integration/System-wide hot keys/Global auto-type and clear the shortcut already written there (Ctrl, Alt + A); it will change to None. There you have it!
To change Alt + A keyboard shortcut go to:
Tools > Options > Advanced > Auto-type (button at the bottom)
and change key combination here.