About the scriabin (someone wrote something before about him) there are many places in his music,where you CANOT reach the chord even if you have the bigest hand in the world,ALL PIANISTS FOR EXAMPLE play the end of etude op 56 no 4 (last measure last chord),arpegiated,while it has no such sign.So never feel bad if there is a place or two you cant reach.You cant reach it but YOU have to play it arpegio style.(no arpegio sign is there in the edition)
It is like some piano transcriptions for example in stravinskys petroushka transcription in the final movement,it has some notes in the page that cant be played,(small notes),they are there to show you HOW it should ideally sound.You dont play the notes,but you see them.
Think of the etude.The composer would want to hear it complete chord,but there is no human hand that has this stretch in the left hand (though i tried something else and worked, i play gb,db,cb, with 5,3,1 of my left hand, i bow down my head and use my nose a little bit before to strike the f,and i have the stretch to play cb,eb,f,Bb,Eb, with fingers 1,2,3,4,5 in the right hand) (I can easily stretch a 12 with no problems at all).The trick with the nose when i saw it to my teacher she could not stop laughing.The sonority was awful,i mean you do not want to hear the chord as is written it is meant to be played arpegiated.
So do not feel bad,quick rolling is essential skill,(no need to use the nose:)