Dennis
Couldn't Hammond had just paid Nedry some extra? I mean he was a senior programmer who seemed to be in control of the most important aspects of the park. You also had what appeared to be a volatile relationship with him, so just pay him (since he controlled all the keys to the kingdom) until you get a replacement. If you can't get a replacement in time, well you "spared no expense".
Knight should have got more roles after this. He played the character given to him perfectly.