Does it still work? If yes, leave it alone
While I often complain about outdated code, I'm tempted to second that.
Ren'Py have a relatively strong backward compatibility and sometimes it's just better to follow the "it if works, don't change it" rule. Especially when "changing" do not imply an effective improvement.
By example,
imagebutton
s are better than
imagemap
s because more flexible, but for the
im.
part, it's mostly a new way to do it, way that generally just hide the call to the old
im.
function.