Dear Jason,
1, For active BA list it is recommended to delete all unnecessary BCCHs(only the BCCHs are needed which you have defined their Cell IDs as neighbor cells), because it cans easily affect HO success rate.
2, For Idle BA list it is recommeneded to include all band(all available BCCHs including the BCCH of serving cell) in idle BA list, because it is definately helpful for cell selection process when an MS in switching ON.
Thnak you
MF