if Autodesk really cared about this, they would make a filewatcher util that looked for a new acad.lsp and other startup files appearing in project folders. Its fairly easy to write in .net, but somehow the real issues people get hit with are not exotic enough to be dealt with. Instead we get "lisp signing" and "total control" type security in 2016, as if its needed or decent to implement in an office with people that actually write scripts and minor lisps as they work.
Are they trying to squash user customization with lisp, just like they did with the CUI system that wants the main menu to be the acad one, yet user customization happens to the main menu at the same time. So you have to play the menu switch game which never goes well in the end. So not we do not make custom toolbars. Thanks Autodesk.