Hi
The Timpani only has hits and Rolls, and doesnt seem to have dynamic articulations...but its lovely!
I suppose you could stack 2 groups of 14 violins, but i dont think that would work so well, as then when you have two notes per stave youd here 28 violins (as 14 would play each note)
a better way i think would be this.
If your going to be using Sibelius, make two violin staves. 1 would be for 1st violins (for example 14 from the Orcestral strings in pack 1) and the other could be the Chamber strings from the other pack....2 i think!
now...and its not really a massive hastle, if you want your strings to play divisi, use the chamber string stave for these passages, as i think there a 6 violins (so if you want to divide you strings a2 then you'd here 12 strings. 6 playing each note) for those notes.
i use this for solo violin passages and im happy with the results i'm getting. its not perfect, but thats why my wallet is hiding from Dimension strings!.......that they have a sound set for by the way!
i use 2 flutes for music i'm writing at the moment, and use 2 staves (1 for each flute) so its not really an issue with solo instruments.
A BIG......BIG......MASSIVE tip to give you!
Writting in Sibelius is wonderful, but to get it to play back really well have a main score.....lets call it the original score and then save it and make an exact copy and call it something different like PLAYBACK.
Once your happy that the Original score is written correctly, and i often cut and paste the divisi staves into the main violin stave as all expression and system text is there (a2, divisi etc) then.........Save it and.....DON'T TOUCH this one!
Tweak to your harts content the PLAYBACK score...as if you use Sibeliuses built in dynamics plugins you may need to use the delete, or undo alot.
Good luck mate,
Kindest
Paul