Merge Pull Requests from your phone
github.com
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Sure, for some changes this may be fine ("TRIVIAL: fix typo"), but it seems to me this sort of thing will only encourage sloppy work.
You can do it, but it is anything but ideal and people are prone to take shortcuts, particularly when something inconvenient and based on the 'honor system' appears.
I'm trying to think of a good analogy here... "It is like allowing people to use 'water wings' and pool noodles in the deep end of a pool", if that makes any sense.
In many cases, the person who merges the pull request is the person who created the pull request. The author will create a pull request, let his collaborators review the code, then hit merge once he gets a "LGTM". Presumably, the author has already tested his changes.