Bunch of issues here:  
  
1) I was finally bitten by the "keychain breaks scp" issue I had vaguely    
mentioned earlier:    
    
On a box with FE keychain installed, opt-in enable some user who has bash or    
csh as the shell and some SSH keys that require passphrases, and ensure his    
ssh-agent/keychain stuff is NOT active ("keychain --stop all").  Then, try to   
scp something from another box to that account: doesn't work, the _remote_ end    
starts prompting for passphrases.    
    
2) The opt-in stuff in ~/.keychainrc doesn't work as advertised because zsh    
treats the args differently from other shells (foo="foo bar"; echo $foo #    
results in one argument "foo bar" passed to echo, not "foo" and "bar").  
  
3) The opt-in mechanism seems to Just Work out of the box without any special  
tricks with zsh (maybe in >= 4.2.0-3), so README.Fedora should be updated.  
  
4) 2.6.1 is out.  
  
I took the liberty of fixing all of the above as well as other couple of  
cosmetic issues, patches attached.  Tested on FC4 with bash, pdksh, zsh and 
tcsh, and basic idea additionally with ash and FreeBSD's and Solaris' /bin/sh.  
Do you mind if I commit this for FC4 and later?  (I don't have a FC3 box to 
test with.)