Hello. Please consider moving binaries from dev-lang/execline (there are many of them) out of /bin directory. Since they are not (normally) used during first stage of boot, they belong to /usr/bin. I would argue, that actually there is no need to install them into PATH at all: they are hardly useful outside of execlineb scripts. I propose to move all binaries except `execlineb' into /usr/libexec and to apply patch to `execlineb` to automatically add location of auxliary scripts into path. See https://bugs.debian.org/922642.
The execline revdeps (s6, s6-rc, ...) assume that all execline tools are in the same directory; so the setup you're suggesting would be completely broken. And I'm not willing to move execlineb from /bin to /usr/bin since its location has to be hardcoded in shebang lines and a move would thus break the systems of all users -- which is not something I'm going to do for purely aesthetic reasons. I'm closing this bug for now; feel free to reopen it if you can present convincing /technical/ reasons which neccessitae a move.
Oh, it looks like I've misread the code; in the default config, it's only assumed that all execline tools are in the PATH, so it may be possible to move the execline tools to /usr/bin while keeping execlineb in /bin. This is still not something I'd do on a whim without good technical reasons, though. And if you want an aesthetic reason why the tools should be in /bin, consider that /bin is traditionally meant for all executables which are required to boot a system, and the execline tools clearly fall into this category on hosts which use s6-rc.