[Asterisk-Users] Better transfer

[Leif Neland]

I find the transfer functions a little lacking.
Examples:

I get a call
I do an attended transfer, but the called extension never answers/I get 
impatient/I discover I have dialed the wrong extension.
I can not get the call back.
If I hangup, the caller is also hung up. I'd prefer the caller to stay 
online and be ringing my phone again.

If I do an attended transfer, and hangup before the 3. part answers, the 
caller is disconnected.
I'd prefer the transfer to be turned into a blind transfer, the caller 
coming back to me if the called ext is not answering

If I do a blind transfer, and the called ext is not answereing, I'd like the 
call to come back to me.

Can this be done in dialplan, or must it be changed in the source?

Leif