Thanks for your post.
I'm afraid neither are possible with the current version.
The option to create a scripts folder is designed to be used to represent the complete schema of the database so it can be used as a data source. The scripts themselves aren't really designed to be deployed to other environments.
Likewise, the deployments scripts that can include 'IF EXISTS' are designed to be a single script and can't be broken down per object, unless you go through and create a project for each object. If you right-click on an object in the results grid, you can create a single deployment script for that object, but you can't get it do that for all objects in one go.
If you don't mind me asking, why do you need the existence checks for each script?
Feel free to log the suggestion on our uservoice
site if you need it added to the tool.