Shorten The End Call Time With This Simple Reg Edit
 

The default time your phone takes from the point you hit end call to it ending the call is 3 seconds. I find that annoyingly long. Here is the registry value that controls that time:

[HKEY_LOCAL_MACHINE\Software\HTC\PHONE\PhoneExtendS etting]
"EndCallTime"=dword:3000

3000 is the time in seconds. I changed mine to 1000 which I find great because now it takes me 1/3rd less time to end my calls!