Starting with "audio" and/or "smelt" can give you a few letters.
I can't see any way to select UK English.
I use "BEAUS", "TONIC" and "GLYPH" as my starters. However, if you search for the best starting combination, you'll find better (?) computer generated suggestions. I like your starters, though. They look better than mine.
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"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
I don't think Americans appreciate there is any other kind of English :)
I haven't found it an issue with five letter words; "color" I suppose.
I would like the keyboard to have a space bar. I like to visualise the word and have to use an 'X' (or something) for the unknown letters, a space would be better.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland