Here are the flags for all the default sequences (those omitted do not have any):
m_activate.dsq: priority 64, blend
m_activate2.dsq: priority 64, blend
m_armattack.dsq: priority 64, cyclic, blend
m_armreadyboth.dsq: priority 14
m_armreadyleft.dsq: priority 14
m_armreadyright.dsq: priority 14
m_back.dsq: priority 12, cyclic
m_crouch.dsq: priority 20
m_crouchback.dsq: priority 21, cyclic
m_crouchrun.dsq: priority 21, cyclic
m_crouchside.dsq: priority 21, cyclic
m_death1.dsq: priority 128
m_fall.dsq: priority 7
m_headside.dsq: priority 0, blend
m_headup.dsq: priority 0, blend
m_leftrecoil.dsq: priority 64, blend
m_look.dsq: priority 8, blend
m_plant.dsq: priority 64, blend
m_root.dsq: priority 0
m_rotccw.dsq: priority 64, blend
m_rotcw.dsq: priority 64, blend
m_run.dsq: priority 12, cyclic
m_shiftaway.dsq: priority 64, blend
m_shiftdown.dsq: priority 64, blend
m_shiftleft.dsq: priority 64, blend
m_shiftright.dsq: priority 64, blend
m_shiftto.dsq: priority 64, blend
m_shiftup.dsq: priority 64, blend
m_side.dsq: priority 12, cyclic
m_sit.dsq: priority 64
m_spearready.dsq: priority 14, blend
m_spearthrow.dsq: priority 14, blend
m_standjump.dsq: priority 8, blend
m_talk.dsq: priority 0, cyclic, blend
m_undo.dsq: priority 64, blend
m_wrench.dsq: priority 64, blend