Currently, when multi-editing contact receivers, you can enable "Write to Materials" but cannot edit any properties. For a number of systems, it makes sense to allow for multi-editing the "Target Renderers" and "Write Matching Tag Bitflags" sections. The "Shader Parameter Override" would also be useful, but would have to come with a warning about clashing if multiple renderers have the same tag set, as it will behave unpredictably (an additional canny will be posted for this)