The MetaC programming language is a 100% backward compatible extension to the C language that adds reflections and the ability to analyze and modify C source code at compile time. It has been specially designed to search for arbitrary code structures and instantiate new source code. Typical applications for MetaC based meta-programs are development tasks concerning embedded and real-time software. Examples are API abstraction and retargeting to a new API (ever been locked to a vendor-specific API?), application specific debugging and profiling on an embedded target, and WCET measurements.
xjobs runs several jobs in parallel and limits the number of jobs running at once so that every processor of the machine is busy, but not overloaded. A batch of long-running processes invoked from the shell are normally executed one after another, no matter how many processors are available. xjobs allows batching those jobs while still keeping the machine busy. The interface of xjobs is similar to that of xargs.
MT-write is a binary patch for multi-threaded writing. It comes in the form of a shared object that can be preloaded to programs like tar to make their write operations multi-threaded. Multi-threaded writing can improve performance on RAM based filesystems and highly scalable filesystems with multiple spindles.
This effect is due to argument parsing. This actually enables xjobs to pass more than one argument to every job, and even inconsistent number of arguments between jobs. So this is a feature not a bug. The latest release has a new options -1 and -0 that simplify the usage scenario you are complaining about.