So, I'm working on a block with expandable defaults like they do in MQTT.
For now, it turns from my block @addInput :: reporter operators to my block test val <> @delInput :: reporter operators. However, I want to set test val's default to <t> :: reporter operators instead of just <> :: reporter operators.
How do I accomplish this?
I don't know the answer to your question, but... is that a custom block color? The white text is illegible against it.
Nope, it's just Snapblocks. Caught someone off-guard with pretty Snapblocks again, huh? 
It is snapblocks, and maybe the reason why it looks illegible, is because the snapblocks svg has a higher resolution than snap, so the dropshadow might be a tad off, even though I used the same measurements as snap.
I don't think you can at the moment
That's why I used true/false text values in the MQTT blocks (that can be overridden by inserting the Snap! boolean reporter.)
When Jens starts work on V11, I'm hoping we can have something like <true> in the default options and Snap! will translate that to the proper boolean block