Have made a copy of the quicktags plugin >> _myhtmltags.plugin.php
Removed a few header comments and the modified line is now
See below for former hack
I have added a prompt to request a target when creating links. I have made [_self] the default value.
There is no need to enter the underscore [_], that is hard coded, so any target value will be prefixed with an underscore. So just need to enter 'blank' for example
Line 451 in versions: 6.9.3 to 6.10.2