A subtle cue would be nice that separates accounts with contributions from those without, without going all the way to having a count of contributions directly in the UI. some whitespace between a group with and a group without contributions would work, or perhaps better for groups of accounts for which all have no contributions perhaps a grey background behind the whole list.
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Something I'm entertaining is whether Special:SI could surface staleness data directly. It would be nice not to have to rely on a staleness script checker which is only guessing anyway as to whether data is available for an account.
Figured I'd put that here since it's roughly in the same category of "could use a potentially subtle cue as to whether it's worth even checking an account" but a different task is also fine.
Not sure how strong the privacy consideration is for "has(n't) (attempted to) logged into an account" and whether that's of the same quality as the current signals available.
It would nominally be a boolean "active inside current window / inactive inside current window" indicator.