I love the visualization feature - use it all the time to verify protection, see where the fields stop and for where to start looking for new field placement.

Sometimes however, I wish I could just see where my protected blocks already reside. They are usually already covered up to protect them from being broken, so it can be difficult to track them all down.

As such, I'm respectfully requesting a second type of visualization that simply builds a small tower of the protection stone type to aid in seeing exactly where the already placed protection blocks are located. I believe it would also be less resource intensive than the full visualization (due to needing to paint dramatically less new blocks for both setup and teardown of the visualization), and I think this would allow it to be used in larger areas where many fields overlap.

One caveat would be to disallow the breaking of those blocks manually so that people couldn't harvest extra blocks "illegally". I keep the default glass block for the FULL visualization, so drops are a non-issue there.

This had actually already been added as far back as 4.0, just that it wasn't working. Feature completed on 5.5 use /ps mark