Currently, the pi block in SciSnap! uses the standard pi symbol (π) and looks like this:
This means that it looks more like the letter n than pi, but if you use this version of the pi symbol: 𝝅 (U+1D745), it looks like this:
This is clearly more understandable, and I would recommend changing the SciSnap! library to use this version of the pi symbol.
EDIT: If you add the $ symbol before it to make it not bolded, it looks even better:
Secondly, the
block is already covered by the and block in the normal editor. The same applies for the "any of" block (covered by or).
For suggestions like this, providing the Unicode value of the character you want would help. Also, in your pictures the one you prefer is smaller than the current one, so I think if Eckart takes your suggestion he should make it bigger.