Scratch

There are quite a few 1s1s projects out there. Problem is, nobody can remix them. In Scratch, every script can only be so long before it 'breaks off', and becomes uneditable. To cope with this, you could break up the script into induvidual sections. You could do something like this:
[blocks]
<when green flag clicked>
(some stuff here...)

<broadcast[ 1

<when I receive[ 1
(some more stuff here...)

<broadcast[ 2

etc.

Or, you could do something like this:

<when green flag clicked>
<forever>
<broadcast[ 1 ]and wait c>
<broadcast[ 2 ]and wait c>
<end>

<when I receive[ 1
(some stuff here...)

<when I receive[ 2
(some more stuff here...)

etc.
[/blocks]
I know that this technically wouldn't be a 1 script project, but it's a virtual 1 script project, because it acts the same way.

If you don't understand or have a question, just post it!