1. It would be really great if workspace have funnel visualization implemented on it.
2. Add unlock function on graph visualization after lock function is active.
Request #1 is in progress (we're working on adding funnel visualizations now).
If I understand your second request, it's about clarifying whether Lock Selected Items or Lock Selected Positions is active. My understanding is that only one can be active at a time, and it's not very clear which is selected with the current design. Excellent feedback.
Implemented as of 20 October 2016. Use the Fallout visualization to do funnel visualization and analysis.