I do all my conversions with DxO, including cropping, straightening.
I find the results more to my liking than other converters I tried: Silkypix, Bibble, ACR in Lightroom and Capture one. Mind you that was 3 years ago. I made my choice at that point and didn't look back.
I also find that even pictures with lenses that don't have a specific correction module benefit from the DxO 'treatment' even more so in Version 6.
So, to answer you first question - can you create jpg's with DxO: certainly!
You might benefit from
some light reading
It's on the Process tab that you define the output you want (left upper corner). You can set up more than one to create a DNG and a JPG for instance.