What feature or improvement would you like to see?

These should be possible:

dbapi.connect(driver="postgresql", uri="postgresql://...")
dbapi.connect("postgresql", uri="postgresql://...")
dbapi.connect("postgresql", "postgresql://...")
dbapi.connect("postgresql://...")

In the last case, we would check if the URI looks like a URI in the driver manager and assume the URI scheme is the driver name. (So not all drivers would be able to take advantage of this.)