Comrade, because of bad connotations associated with the term "revisionism," any positive additions / corrections should be labelled as "redefinitions" or "reformulations."
It is true that there have been both intended and unintended revisionist attacks on Marxism. Apocalyptic predestinationism has this danger of leading Marxists to propose lesser demands and then consider them to be "revolutionary." In the late 19th century, it came in the form of the Erfurt Programme. In the 20th century, it came in the form of the Transitional Programme.
Heck, even Stalin's SIOC was based on the notion that, because capitalism was about to go under, foreigners would "spontaneously" have their own revolutions while the USSR went along its way towards "building socialism."
Now, in terms of "redefinitions" and "reformulations," consider the last three merger formulas. In the thread on multiple merger formulas, the fourth merger formula wasn't formulated by Kautsky, but was unintentionally arrived at by Lenin (although he himself upgraded Kautsky's merger formula to go beyond the labour movement of union organization - the second merger formula was the one that Lenin intentionally arrived at).