What is the problem if you "crash" Oracle? It'll do instance recovery upon startup and granted you setup your system properly that should work smoothly.
You could also put shutdown immediate or shutdown abort into your dbstart script. However the init process will probably not wait until a shutdown immediate goes thru on a busy database, you may give that a shot tho.
There are a bunch of discussions about the pros and cons of shutdown abort/immediate in the Oracle newsgroup.
