I don't think so...
if the field doesn't need to be editable in browse mode, you could make it a drop list and uncheck available in browse mode.
So the user cannot see the drop list when clicking on it (field not modifiable) but when in Find mode the list is there.
try with two occurrences of the same field, one over the other; the first one accessible in Browse Mode, the second one in Find Mode.
Its on a report layout so doesnt need to be accessible in Browse mode anyway