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If user has no gravatar account, gravatar will send a default image like this page. This page shows 2 avatar source.
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Yes, but what if a user wants do have an avatar but without signing-up to gravatar? 

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But, a switcher in application.conf is needed ( snip.comment.avatar=on/off/true/false ), it preserves the blog owner to open or close this feature.
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Yes, I already was thinking about that too.

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Would you mind how about to create a snip/wiki page to save the forked version's final implemented feature list ? Discuss here, but result there !
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Sounds a good idea. Here's the page [my_snipsnap_fork_feature_list]