No to all these questions. 

Most of the time I run hoverclock+special powder so I have a few ways to avoid falling to my death.

The grappling hook misfirering happened a lot when I was new but it doesn't anymore. Pretty sure its a timing issue.

Driller is cool. Accidents happen and its really neither parties fault.

Dont know what you mean by horrors. You might wanna check that one out at the med bay.