Well, those pins can be removed, you know... 
Joke aside, what I'm trying to achieve is either so simple or not possible, giving the fact I didn't find an 'on spot' solution around.
I want to do a custom keyboard that have SHIFT, CTRL, ALT and all the non-character keys functional, using at least one shift register.
For example I have one button that I have to make it behave like SHIFT key, and the 7 others like character keys, all these wrapped in a shift register CD4021BE.
The code I took is from a custom keyboard that is using the same principle but without these non-character keys/ or multi-pressing/ keys combination function
http://lucidtronix.com/tutorials/15