Unfortunately, there's nothing you can do about it if they're going to walk early. They do it when they want to do it!
I had one pretty early walker -- he was about 9.5 months. His feet are fine, for the record. My other two were both under a year also, and seem to be OK.
You can't tell from age of first cruising when they're going to walk, though. My third baby was cruising at 6.5 months and standing unsupported for 10+ seconds at barely 8 months, but I never saw him take a single step until 10.5 months. He didn't walk full time until the week before his birthday! So I wouldn't necessarily say you're going to have a super-early walker.
Edited to add that my DH and I were both 9-month-old walkers, as it turns out. He has flat feet; I don't.
mama to T (7), L (4), and O (14 months)