Expand what could be tracked as events in the ads tool. Make at least the Form Submission (with the option to select specific forms) available. Ideally, all other conversion events should be added (meeting requests, chat, offline...). Eventually, every activity or contact property change should be possible to track individually.
The advance feature could be a rule set up (AND, OR) for combining events.
On the same note, increase the possible trackable events to accommodate the increase in options.