[Logician]

Show Signature
This is configured according to user's signature settings so I dont suggest disabling it hard coded but if you still want to do here is how:
edit private.php, find:

PHP Code:

eval("dooutput(\"".gettemplate("priv_sendprivmsg")."\");"); 


before that add:

PHP Code:

$signaturechecked = ''; 


Save a copy

edit template priv_sendprivmsg find:

PHP Code:

<input type="checkbox" name="savecopy" value="yes" checked> 


replace as:

PHP Code:

<input type="checkbox" name="savecopy" value="yes"> 


Request Read Receipt
edit template priv_requestreceipt find:

PHP Code:

<br><input type="checkbox" name="pmreceipt" value="yes" checked> <b>Request Read Receipt:</b> Allows you to check whether your message has been read by the recipient. 


replace it as:

PHP Code:

<br><input type="checkbox" name="pmreceipt" value="yes"> <b>Request Read Receipt:</b> Allows you to check whether your message has been read by the recipient.