[NTG-context] Bibliography: printing just Single Author et al.

Hi, When citing articles with five authors I prefer to list all of them, but in some articles with one hundred authors I would prefer just "J. Someone et al." since listing five more co-authors doesn't add anything substantial to the information. Is there any trick that would allow liming the number of listed authors on per-article basis? Simply specifying author = "Just Someone et al.", ? (MkIV, experimental reimplementation.) Thank you, Mojca