No, the Avis points program is an opt-in program.
I suspect they have made it harder to get partner points/miles because it saves Avis money. When they did it during the Budget/Avis site redesigns, it was disappointing.
You can call to get it added. Remember, if you don't see the FF charge in the taxes section, it is likely you are on a non-qualifying rental (franchisee) or you don't have a linked partner account (because the box was missing or whatever).
The other alternative is if your preferred partner has a branded booking page, you will usually see the entry box on that version even if not logged on.
AA has two versions for ABG, one is here:
https://www.aa.com/car?execution=e2s1
The other one that goes to carrental.com (ABG owned site) is at:
https://www.aa.com/i18n/AAdvantage/e.../main.jsp#avis
Southwest:
http://travel.southwest.com/specialo...ml?id=66467375
I am sure other partners have a similar non-login page with the option to add the partner with ease.
Rasheed