A general we need archers is fine, but is telling one noble we need archers fine?
Do read this forum post link below I opened up at Questions and Answer there earlier when I have same question. When a noble asks you for advice, yes you can suggest.
http://forum.battlemaster.org/index.php/topic,3708.0.html
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Werewolf Games: Villager (6) Wolf (4) Seer (3); Lynched as Villager(1). Lost as Villager(1), Lost as Wolf(1) due to Parity. Hunted as Villager(1). Lynched as Seer(2).
Won as Villager(3). Won as Seer(1). Won as Wolf(3).
BM Characters: East Continent(Brock), Colonies(Ash), Dwilight(Gary)