No restrictions. Encouraged to maintain proficiency in both ways and all levels of automation (or lack thereof). Flaps full landings personally prefer manual thrust, unless tired or flying an approach with a last-minute alignment maneuver. Flaps 3 tend to use A/THR a little more often, especially with crazy winds (almost NEVER use A/THR in wild winds with flaps full on the rare occasions that landing distance does not allow a flap 3 in such conditions). But that is personal preference, and others do different things, all (should say most) of which are fine.