Block-based programming environments offer unique benefits for editing or integration of visual tools that could be useful across programming environments. However, most general-purpose programming environments are designed around textual representations of programs. We explore the design of a block-based editor that integrates with existing textual environments, using the example of the Squeak/Smalltalk development environment. Through a user study, we show that users felt generally comfortable with our editor’s edit interactions when compared to textual editing. We discuss the design’s difficulties and opportunities we observed during our user study and our own use to help propose block-based editor designs that integrate well with text-based environments.