Hi mjs - many customizations are for just one person's specific needs at that time and not necessarily applicable to more general use...

But in the particular video you show there the customized UI can be installed from here: http://moi3d.com/forum/index.php?webtag=MOI&msg=6507.1

And the distort curve plugin is one just recently discussed here: http://moi3d.com/forum/index.php?webtag=MOI&msg=6659.13

There are also a bunch of various plug-ins collected here: http://kyticka.webzdarma.cz/3d/moi/

In the future at some point I want to make a centralized repository for scripts and plug-ins and make a browser-like interface to make the process of discovering them and installing them to be easier. But it will take quite a bit of work to set that up, currently I'm still more focused on improving basic modeling commands. So for now you have to just follow the instructions in a particular forum post for getting a plug-in and copy some files around.

- Michael