These effects are even harder to score than measurable trinket proc effects. Oftentimes, what I do is assign an "opportunity cost" value to that effect. What this means is assigning a value that is equal (or better than) the AEP/MAEP rating of the next best alternative.
An example of this would be the AEP value I've assigned to Minor Running Speed effects. Pre-Burning Crusade, players often had to choose between two enchants for their boots - - 7 Agility or Minor Speed. With this in mind, I used to give Minor Speed a general value of 7 AEP to make it equal to the 7 AEP you would have gotten if you'd chosen 7 Agility.
Now that I've recently added separate PVE & PVP columns to my charts for special abilities, I've assigned two different values for Minor Run Speed effects to denote their differing value in PVP vs. PVE. More.
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