I just paint my roads onto the tiles as needed using layers in photoshop, once you get the knack of getting them to join up correctly it really doesn't take too long to do.
So far in my Vietnam terrain I have between 15 and 25ish different road tiles for each type of surface.....grass, forest, fields etc etc, the stock ones are way to repetitive for my liking.
I never use the TE.....it's waaaaaaayyyyy to much hassel for my simple mind, just paint 'em in PS & load 'em the the good old TFD tool & the jobs done......Then I make the TOD's to suit using Mue's superb Tod editor.
Same goes for rivers, not rocket science really.