Are papers presented special sessions regarded inferior? I am doing my PHD in computer-engineering (1st year), and am publishing at computer science and hardware conferences. 
My department receives requests all the time, on confernces with high probability of acceptance. (Usually there are too few submissions, so they request for more) These conferences are prestigious, however the sessions, I participate are very specific to a certain project or topic. 

There is a lot of progress on my research, but since I am publishing a lot, it is dilluted into more publications. 
Can this later hurt my reputation, if I publish extensively on these sessions?
Is this a co-located conference/workshop? Based on what I've been told by my adviser/post-docs (I'm also first-year CPE PhD), these types of places aren't where you want the bulk of your research going. You're better off aiming for a higher quality paper at the main conference - it looks better on a CV, and it's far more prestigious.