hi,

I was realised picture for my suggestion: is to add script input for made C blocks ! you can read this here :
http://scratch.mit.edu/projects/10840546

you can watch my other suggestion :

make a report block ( spring/number) here :
http://scratch.mit.edu/projects/10122336/

make a boolean block :
http://scratch.mit.edu/projects/10122411/

thanks for your attention

You already can In the blocks palette, right-click on the custom block, click edit, and then you can edit the blocks title along with adding either number, string, or Boolean inputs.