Right now you can only add new Forums.
If you want to have more sites in the SenukeX, collect all versions from 2.0.0 to 2.5.x and check for unique sites in the folder Config, file "aclist.xml". From every version take the sites and put it in excel file. When you'll have the sites from all versions in 1 column, just remove the duplicates. After that try to make accounts on all of them and when this is done remove the sites that doesn't work.
With this you can have almost double sites. If few words: every version of senukex have new sites and some of the old are deleted but still working. You can find plenty of them in the aclist2.xml file. For example hubpages, blogger and others which are not in the standard list.
I hope this can help you.
Best Regards