I, myself, have several external runtimes sitting on my hard drive which actually make my access easier and more controlled.  It is figuring out a logical method of organizing your files without wading through one enormous runtime file.  But there is a disadvantage of too many runtimes.  I tend to break up my projects into individual runtimes; load what is necessary for the scene, compose and render.  Afterwards, the project is either burned to disk and removed from the hard drive or delete it completely if I feel I will never need it again.  This is a great Tutorial and many individuals will benefit to read it through before amassing an unmanageable runtime.  Been there, done that.