Thank you, Daniel, for reply.
It would be very usefull to define every aspect of instrument. I can’t wait.
Perfect solution would be to have something like „instrument designer” and to have possibility to create instrument from scratch, to invent the logic of playing on given instrument. Noteheads, staves, playing techniques, cleffs, transposition, groups and brackets, etc., so composers will be able to create their own instruments or use standard instruments in unstandard way.