Brushes in the Liquify Filter

I thought it would be great if the brushes within the Liquify-Filter would work like outside of it. Meaning: Same shortcuts for changing brush size and softness. Whether it's the context menu or right-clicking to get the brush properties.

I don't know if it would be a too huge computational task being able to use different brush-patterns when using this filter to assure smooth and lag-free feedback.