Cutting corners only means you have to rebuild it sooner. And usually with more effort due to damage which could (should) have been avoided.
I have a strong suspicion that leaving that bolt like that will result in a leaky gasket. Sure there's "a lot of other bolts" holding it down, but each bolt has its own "area" of the gasket to torque down. Leaving out a bolt will leave an entire area loose and asking for a leak.
I used to take shortcuts to get the bike back on the road ASAP. Now after a lot of money spent in needlessly replaced gaskets and burned up time, I can say I don't take shortcuts anymore cause it's only gonna cause more pain down the road
Besides, is that a hole knocked in your rocker cover next to the cam chain?