As the title implies, on my server I was attempting to use the underlay brush with gunpowder on a hollowed out mountain in an attempt to add blocks to the underside.

Instead of doing so, however, the brush simply responded with nothing -- is this a bug?
(Using the arrow tool works fine and replaces blocks as it should)

Thanks in advance.

It seems that the Gunpowder tool is not implemented in the Underlay brush.

That's what I assumed; could this be implemented, then?
(not directed at you, Mike... Just to be clear :) )

Ill get Jmck to work on it. The underlay brush is categorized as "In development" (You can see that on the wiki). Sorry is this causes you any issues!

Jmck said he is working on adding this. Expect it coming in the future relatively soon! *Ill close the topic when its added

Merged jmck's code into it.
Closing this ticket for now.
If any errors still are present, please let us know and just open another ticket.
Thanks for reporting.