Formatting citekey generator to depend on number of authors

Hello,

New to Zotero here. I'm trying to set up the cite key generator in Better Bibtex to have the following format:

auth(0,1) + ":" + auth(0,2) + ":" + auth(0,3) + ":" + year


What I'd like is for the cite keys to vary depending on the number of authors, so:

one: smith:2010
two: smith:robinson:2010
three: smith:robinson:johnson:2010

The above works for three authors, but less than that and the output is not what I want, e.g., 1 one author publication:

smith:::2010

How can I get the output I want here? Thanks!
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