Regarding your Icedove issue: Yes, this is due to a bug in 7.0a1 (https://trac.torproject.org/projects/tor/ticket/20761). Resolving that one takes some time as we need a tor patch as well (which meanwhile landed on master). We hope to have that issue fixed in the next regular alpha release.
Sandboxing on Linux is nowadays relatively straightforward thanks to Yawning's work. We provide binaries for 64bit systems on our download page: https://www.torproject.org/projects/torbrowser.html.en#downloads-sandbox More information behind it and system requirements needed can be found on: https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/Sandbox/Linux
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