Sometime you search for a constant or variables used in different drivers and there is no way to do a global search per driver or per driver set. I usually do an text import and then do the search in the text document, but a included option might be very useful. thx
There is a Search option in Designer that is actually broken it seems in 4.8.2 (or works once then fails) but this might accomplish the need to Find. But not the Replace. Perhaps this could be extended to Replace as well?