2 possible features
We're not Windows specialist :(
We've noticed on our 2000 that when you click on a distribution with right and read Properties with some distributions you can see
1) the digital sign of the tool producer
2) the info of the tool producer (we've noticed that these fields are used only by msi distributions)
We think that these features are important for a professional distribution.
We'd like to find them in your wonderful NSIS :)
SANFACE Software
http://www.sanface.com/