Only for things that are limiting, not for new functionality (at least not without great complexity; it is indeed theoretically possible).
That's why RC is implemented as a soft fork and can be changed without a hard fork. All is does is limit the ability to perform transactions (when your RC runs out). Other soft forks have been used to block transactions taking advantage of exploits in the past. So again, limiting.
ok, thanks.
That's good to know.
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