Either my AleBoxes, or John McKinnon has a solution you can find.
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Thank you. Wanted to be sure there wasn’t anything newer since I know this is an old thread. Checking out your font. Thanks Dan!
Sounds like something you might find at a pub. 
With every upcoming release I find myself back at this post, hoping that now is the time for aleatoric boxes.
Here’s hoping for 5.1!
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I’m sorry to say that this won’t be included in Dorico 5.1, but we know it’s a highly-requested feature and it remains very much in our plans.
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“I thought it was very effective.” seems to be the usual positive response. At what, remains unclear.
As a performer, they take up a lot of time discussing how to follow the instructions (or devising a scheme where they are lacking): and they end up always sounding the same.
My favourite aleatoric piece is that one that orchestras do at the start of every concert.
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Ah yes, a classic!
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Same! “This one’s a favorite! They play it every time! The performers know it very well; they don’t even look at the music.” 
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Hello @Alex_Eddington,
Well we are all waiting for a fully functional aleatoric music writing integration in Dorico, but in fact it won’t be a easy task to achieve. After all the lines, the curves, the boxes should not only look fine on the score sheet, but they also need to playback correctly. 
Currently we are able, through workarounds , to achieve a lot in both look and playback, but takes more time and effort.
So, the implementation of a native Aleatoric and Modernist music writing, with it’s correct playback, will be a long journey for the team.
Best wishes,
Thurisaz
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I’m not expecting or needing playback from aleatoric tools in Dorico! I just want to be able to notate boxes and such natively.
Dorico already can do cool graphical things that aren’t played back accurately (yet): for example time signatures like 4/6, and glissandos 
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Agreed.
Jesper
I’m glad there are some of you. But you know that the moment they release a version with native support for such boxes, a majority of users of the feature will complain when it doesn’t play back the way they expected!
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Lutoslawski used a different aleatoric notation that involved repeat marks, seen here:
Anyone doing this in Dorico? And is it possible? I personally like it better than boxes.
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If Dorico can teach a computer to improvise (and still please the composer) that will be a major coup.
Hi @John_Ruggero,
On you questions:
Yes, repeat barline + arrow continuation line (or other line) is possible graphically in Dorico.
Here is an example:
Best wishes,
Thurisaz
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Thanks, Thurisaz! I thought that would be a lot easier to do than boxes.
… and if you enter each time signature as local, you can then also enter each repeat as local, so they only appear on that staff.
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Maybe 
I like to use winged repeats as they are a little more „boxy“ and easier visible for the players.
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I have done same. When the Line tool came along this got easier and more fun
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