I started with LL 1.08 too and have used each version to the current version. Jerry wrote before basically that Ubuntu Software Center and Lubuntu Software Center installed unwanted (and unknown stuff). I think the Lite Software Center was a LL face on the Lubuntu Software Center. Is Ubuntu Tweak the same as Unity Tweak. I learned to live without the software center when LL dropped it by searching on the internet for programs then using Synaptic to install them. Lite Software was a nice addition that came a few versions down from 1.08.
XFCE can be tweaked easily without any extra program. As posted before you can get the Ubuntu Software Center, Lubuntu Software Center, and Ubuntu Tweak but I don't recommend it.
No offense, but if you want that stuff, you might as well use Xubuntu. Doing so, you would give up Lite software and tools, and this great forum where you even get help from the creator of LL, etc. I think you will be happier with Linux Lite than a Ubuntu flavor. I know I am.