We've got a client that requires a description longer than 50 characters for some of the dimensions. This is not possible to do it through the front-end as the EVDESCRIPTION property is greyed out but I've found that changing the size column through the back-end (tblproperty table) has the same effect. I've run a test on our development environment and everything seems to work fine. Anyway I would appreciate if anyone who has already gone through the same process can share his impressions.
P.S. By the way, does anyone know why is the EVDESCRIPTION property stored as an INAPP property? At first glance I don't see the reason for storing this into the cube, as it's mainly used for retrieving the value stored against it and not to filter in the cube.