> This is neat, but really disappointing that there is no feedback when…

Here's how you can say the same in a more positive manner:

> This is neat, and it would be even better if there was feedback when…

To keep up the hacker spirit, I find it amusing that the words "but" and "and" are logically equivalent (i.e. they both are representations of the logical ∧ operator), just with different connotations. :)

(Edit: It's actually a social hack to say your negatively toned "but" phrase with a positive "and" instead.)