Linux 32-bit: SoulseekQt-2016-1-17-32bit.tgz
Linux 64-bit: SoulseekQt-2016-1-17-64bit.tgz
See the Changelog for list of features and fixes.
I'm not exactly sure what you mean by this one. Are you talking about multiply selecting users in the room user list and adding them to a specific user-group? Or as members of a private room?