Linguistically, showing me a spark chart of the use of a lemma in canonical order ... well the canonical order deemed most common among Logos/Verbum users ... is a nice but minimally useful feature. However, something that is important to linguistics could be easily added ... time. Could we have a separate spark chart that placed the books roughly in the order that they were written? Then the spark chart would provide a quick view of the change of frequency of use over time.

P.S. It would also be a great feature to have the canonical spark chart in the canon sequence of one highest priority Bible.