What is the difference between workflow entity methods and tasks

[joebordes]

It is all about the parameters the function/task needs. If it does not need any parameters then you can get away with a lot less programming, just do what you need: that is a custom method, if your task requires some sort of configuration settings and options then you need to implement a configuration screen: that is workflow task.

http://corebos.org/documentation/doku.php?id=en:devel:addworkflowfunction