Here's a snip of an opinion piece about Bybee and his signing off on the torture memos. While it doesn't address your question of recusing himself from certain cases it does address why he should resign completely, and I absolutely agree with that...
http://www.philly.com/philly/opinion/20090426_Judge_Bybee_s_cruelty__In_approving_torture__his_remoteness_from_the_actual_torturers_increases_his_degree_of_responsibility_.htmlSun, Apr. 26, 2009
by Jon B. Eisenberg
Judge Bybee's cruelty: In approving torture, his remoteness from the actual torturers increases his degree of responsibility.Jon B. Eisenberg is one of the lawyers representing the plaintiffs in a case challenging President George W. Bush's warrantless wiretapping program And she quoted from the judgment against Eichmann: "
he extent to which any one of the many criminals was close to or remote from the actual killer of the victim means nothing, as far as the measure of his responsibility is concerned. On the contrary, in general the degree of responsibility increases as we draw further away from the man who uses the fatal instrument with his own hands."
Bybee did not write the torture memo he signed; it was written by John Yoo, then at the Department of Justice's Office of Legal Counsel and currently a law school professor who writes a monthly column for The Inquirer. Bybee just signed off on the memo, two desks removed from the torture chamber. Did he even read it? He must have. Did he think much about it? How could he have, and then signed such an abhorrent thing? This is evil thoughtlessness.
The judgment against Eichmann speaks to Bybee: Far from absolving him of guilt, his remoteness from the actual torturers - his thoughtlessness - increases the degree of his responsibility. His is a special kind of evil - the evil of nonchalance where there should be outrage.
Arendt quoted Eichmann's defense attorney as saying: "Eichmann feels guilty before God, not before the law."
I wonder whether Bybee feels guilty before God. He certainly has no business being a federal judge. His presence on the Ninth Circuit Court of Appeals brings disgrace to that court. He should resign.