Yeah, installing soundsense on Ubuntu looks like it might be a PITA. Not super difficult if you are familiar with how Java, pulse audio and lib32 libraries work, but probably unreasonably difficult for newbies.
Having DF show up in the Software centre is unlikely because Ubuntu basically rides on the work done by Debian. Debian only packages free (as in freedom) software and DF is not free (as in freedom -- it's only free as in beer). So the only way it will happen is if somebody else does it.
It's not super difficult to make a "deb" package -- especially for something like DF which has few dependencies. I'm running Arch linux and the dwarf fortress package actually has no dependencies at all, so probably the same will be true for Ubuntu. For what it's worth, here's the Arch package build script for soundssense:
https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=soundsense Again, it won't help you build a debian package unless you understand it, but it's a starting point.
If you do it, then you will learn a lot about Linux along the way -- *and* you will make an easy to install debian package that anyone can use. Tools like DFHack and DT are a bit different because they require that you open up a security hole on the computer (you have to allow one process to muck with the memory of another process, which is a *very, very, very bad idea*... No idea why Windows allows it...)
But anyway, I encourage you to give it a try. While it might be quite frustrating and take a long time, all information is available online and it's the kind of thing that anyone can do if they work at it. Although I don't have Ubuntu installed any more, I've built deb packages before, so fee free to PM me if you have any questions.