[msebor]

WG14 in general looks favorably at proposals to align C more closely with C++ (within the overall spirit of the language) and I'd expect (1) would viewed in that light.

I'd also say there is consensus that (2) would be beneficial. There are some good ideas in http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2067.pdf although I don't think repurposing the register keyword for it was very popular. Not just because it wouldn't be compatible with C++ which deprecated register some time ago, but also because it's novel with no implementation or user experience behind it. My impression that this is waiting for a new proposal.