adding an "Add trigger…" option to the contacts' context menus would make it much easier to create contact-specific rules (sometimes called "buddy pounce" / "buddy alert"). activating that menu item would create a new rule "When contact changes status for contact <the selected one>" and open it for editing.

this would be especially useful because entering contacts into rules is error-prone as there is no auto-completion or similar for selecting the contacts. (that would be a bug by itself, but i think it is better handled as described above.)