All the current moderling features moved to Modifiers

Hi, I keep coming across modeling features that are 'destructive' or 'single shot' in Blender. Things such as 'knife project' would be really handy to have as a modifier. I reckon a 'bridge modifier' (such as the one in Looptools) would be useful. Assign vertex to a selection, and the modifier constructs a bridge, twists, options to remove poly's, etc. Throw on a 'solidify' and the pipes reconfigure as the selected vertex are moved about. throw on a 'build' modifier and we could grow the connections between poly's. So much of the stuff that is already in Blender could really use some love. Do what was done with the 'smooth shade' , don't move the menu item, just have a modifier created when the item is selected.