This is "Preset 4 — 19-ET Bosanquet" in version 1.0 of the official manual, and "Preset 5 — 19-EDO Bosanquet" in version 1.21.
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18
Clyde + Sensei + Negri
19edo notably does not have a neutral third, and thus no neutral thirds mapping. The closest thing to a neutral thirds mapping is Bryan Deister's mapping that supports both a 9L 1s scale, as in Negri temperament, and an 8L 3s scale, as in Clyde and Sensei temperaments, in both cases with a 2:1 step ratio, in 19edo improv (2025). The Negri generator 2\19 (a minor second) is very simple in key movements, being one step right from the root note; this functions as flat ~13/12, near-just ~14/13, moderately sharp ~15/14, and (key for Negri) sharp ~16/15 (the classical diatonic semitone). The generator for Clyde (a Hanson sub-temperament) is 5\19 (a near-just classic minor third ~6/5); reaching it requires movement two keys right from the root note plus one key up or (preferably) down-right. The generator for Sensei (a sub-temperament of Sensi is 7\19 (a supermajor third) that functions as moderately sharp ~9/7 (key for Sensi), flat ~13/10, very flat ~21/16, and very sharp ~32/25; reaching it requires movement three keys right from the root note plus one key up or (preferably) down-right. The range is just over three octaves (although they are almost perfectly level), but on the other hand, if one is willing to trade out easy playing of Negri, this mapping enables division into three complete middle manuals plus a nearly complete bottom manual plus a partial top manual (and other permutations could be enabled by moving the root note and/or the divisions between manuals).
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1
Sensi
If you just want Sensi with extended range instead of the potential for multiple manuals, the Lumatone mapping for sensi is also another option, putting the notes of minor and major chords extremely close to each other, while yielding a range of over seven octaves, although with a downwards slope.
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5
Hanson
If you just want mapping by a chain of minor thirds with extended range instead of the potential for multiple manuals, the 3L 1sHanson mapping is a good option if you want to extend your range while making well-tuned chords easy to play. This mapping works especially well since 19edo can be conceptualised as a chain of essentially pure 6/5s. The range is a bit over 8½ octaves, and the octaves slope upwards very gently.
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Semiquartal
The 4L 1s mapping is also an excellent option, which also extends the range over the standard layout and makes the diatonic scale easier to play than on the Hanson layout, although at the cost of reducing the range to somewhat over 6½ octaves (again with a gentle upwards slope).
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Magic
The Magic mapping has an even wider range and makes 5-limit chords just as easy to play, but the 3L 1s scale is somewhat lopsided with its 6:1 step ratio and higher limit intervals require more awkward finger stretches; the range is over eight octaves (with a very gentle upwards slope).
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7
13
The 1L 2s layout is even more efficient in terms of range, but the chroma goes downwards; the range is over eleven octaves (with a very gentle downwards slope), making it tempting to divide the keyboard into multiple zones horizontally.
