Which method is better for adding stuff to Leveled Lists? Using the AddToLeveledList command or manually adding them in the GECK?

I remember the script method was a big no-no back in Morrowind because it would override any other Leveled List changes. Is that still the case in NV or will it play nice with other mods, assuming a Bashed Patch is used?

PS. sorry if this has been asked before but the search is still (after ~1 year) broken it seems.