>>A Tise pop-up window to enter a Unicode symbol will add little to
already existing standard mechanism.<<
I rather thought of a pop-up window displaying the glyphs as such in a similar way as (but larger than) in Word's Insert > Symbol window.
>>I'd rather not hard code any of non-EWTS symbols into Tise. If my time
allows, it will be better to provide customization options that will
allow to redefine keys to one's own taste.<<
This might also be the ideal solution for some of the "dislocated" keys under European keyboards!