The Extension Tweak 1.7.0 and 1.7.1 has been released.
A new tool makes it much easier to import a XIP package at runtime.
Also, a small reorganization of the extension's page has been applied because the single page with all the tools model was starting to be a bit too big. So there are now two pages: one dedicated to installed extension and the other to local extensions. See https://extensions.xwiki.org/xwiki/bin/view/Extension/Extension+Tweak#HDescription for more details.