Disable fly mode (completely, at creation) for standalone/web executable.

I would like to disable (permanently), for a walkthrough, "flymode", thereby preventing 'flying/walking' through walls.
This leaves the viewer with full 'walking' control NOT just a 'virtual tour' and ,I believe, a better way to involve, and communicate with, the viewer.
This is to prevent 'flythrough' walls, getting lost, seeing unrelated content, whilst giving the viewer the ability to control the 'internal' environment as they see fit.

edit: bad grammar, though there's probably more...