What are ways to get around the small script command?
For example if I wanted to write a big if/else branch.

You'd be better off writing the function in the script editor, then calling it with the 'call script' box.

You can use a script if else branch by using a normal Conditional Branch event command and then choose "Script..." on the last page.
Otherwise I think the best thing is to use variables such as

But there is no legal workaround for making it bigger in any way.
There are patches for it but as I said, they aren't legal. If I remember right at least.