I think you want to use the "DCC -> Chat" Option when you right click on the nick?

If you want to make a "CTCP -> Chat" do that then you can edit the menu:

Tools -> Script Editor -> Popups (Tab) -> View -> Nickname list.

Example:

Code
CTCP
.Chat:/dcc chat $$1
.Ping:/ctcp $$1 ping
.Time:/ctcp $$1 time
.Version:/ctcp $$1 version