Do you have the 50 hours written down in your company policy and point to your employees that requirement before you hire them? if they find out about your 50-hour rule after the facts, you've got engineers searching the Sunday adds.
If you go that route (50-hour), the word will spread that you are a sweat shop, and when that happens, you will have a tough time finding engineers, especially during good times.
I, once took a pay cut to leave a place like yours.
Another time, I interviewed with a firm that had 44 hours minimum requirement in their company policy (talk about guts). Luckily, I asked for a copy after the interview.
These guys were desperate for a senior Engineer to come in, I turned them down cold and I did not tell them the real reason neither.
Once, I worked for a man whose wife was the secretary, boy, did I hate working there? you couldn't go to the bathroom without the wife knowing about it. Squaw should do accounting at home.