Customize Admin New Order Search

Hello,

For my e-commerce store, I am using the add new order functionality in admin panel to manually create orders when they come through phone. Here, I require two customizations. 1. The default customer search is restricted to 3 characters, I want to make it 2.
2. The default product search is restricted to 3 characters, I want to make it 2. Could you please guide me on going about the same?

Ashok