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It is possible to power down 50% (or actually any amount up to your full balance) using the command line client.
However, the same effect can be achieved (and quicker) by powering down the full amount and stopping after you've received the amount you initially wanted.

That's pretty legit. I didn't realize I could stop powering down. That'll be helpful.

Thanks for clearing this up +111 I had no idea you could stop it either.
Was getting worried about that.

No, unfortunately. But I would love if I could. I would love if I could say, "Ehh, I'm ready to start liquidating my position in this." Even if it's only 50% or 10% or whatever, for some of these big whales, that's a lot of money.

I'm also surprised about this. Maybe it's a good idea to have multiple wallets so that you can power down one wallet without powering down the others?

That would be really interesting! And your voting power would be the sum of all wallets unless you had started powering down. I can dig it!