[Avodah] what mitzvos did Avos follow?

[Sholom Simon via Avodah]

>The following are universally accepted
>1]  AAvinu [howsoever we explain his Jewish status] followed all 
>Halacha and even Minhag

Is this the case?

According to R Menachem Leibtag, Avot and the Mitzvot, 
<http://www.tanach.org/breishit/toldot/toldots2.htm>http://www.tanach.org/breishit/toldot/toldots2.htm 
, the Rishonim did not -- and he sites Rashbam, Chizkuni, Ibn Ezra & 
Radak who each have a different take (from most restrictive to most 
inclusive -- but none of them saying Taryag mitzvos).  He also 
mentions Rashi, Ramban, and Seforno who do include 613.  (As they 
each interpret "because Avraham listened to Me, and he kept 
mishmarti, mitzvotei, chukotei, v'toratei." (Bereshis 26:5) )

So . . . what about later in time (late Rishonim and onwards)?  Did 
everyone accept Rashi's view, or did some old by Rashbam, Ibn Ezra, et al?

(In my limited understanding, this seems analogous to RMB's 
discussion of Ma'aseh Bereshis, where most of the Jewish world didn't 
seem to take it *literally* as seven days until the last century or 
so.  So, in this case -- re the Avos and *every mitzva* -- when did 
the general opinion change?  Or did it?)

-- Sholom


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