Yes, but that's how you're getting randomness anyway. In Linux and most other operating systems, the exact time in nanoseconds that a key is pressed is recorded and injected into the entropy pool. This pool is used to seed the CSPRNG that powers
/dev/urandom and other cryptographic random APIs.
/dev/random character device is what we describe as blocking. It assumes that all used cryptographic functions are broken (a worst-case scenario) and so will only output randomness when it thinks it has "collected" enough entropy. When you type keys, the operating system uses that as a source of entropy and increases the entropy estimate, causing
/dev/random to unblock. This speeds up the entropy collection by programs using that device. Now that doesn't mean that the program sare doing the right thing. They should have just used
/dev/urandom which does not block and is still quite cryptographically secure. You should take a look at https://www.2uo.de/myths-about-urandom.
A related document on best practices for randomness generation is BCP 106.