Purpose: To get TclX file functionality into the core.
The -keepalive option should be added to fconfigure for sockets. Possibly other sockopts should be added to fconfigure too.
A new command pipe should be added to provide TclX pipe functionality.
Changes to tcl's file command
A new file type result, tty, will be added. Alternatively, a new subcommand file isatty can be defined on open file descriptors.
A new file option -fileid to allow an open file to be processed in place of the file name argument. (This may not be possible under windows.)
The most frequent request is to move the TclX signal handling commands into Tcl.
Another suggestion that's been made in the past is to create an extension that provides Tcl bindings for the most useful Posix functions.
But what are the most useful Posix functions? :)