1) You maintain the most up-to-date versions (eg 3.4 for Wordpress at the moment). The cricical thing is obviously to modify the standard installation.
2) If I preset plugins and themes, are these pulled from your repositories or Wordpress repos or wherever they are stored?
3) And having installed the software by the APIs, I can install anything I want on top - plugins, themes etc. ie I am not locked into Softaculous in any way?