A Few Ethereum Questions

Hello. A few questions on my mind lately about ethereum have been:

1) Programmability:
How easy is it to program an eth wallet such that when payments are made into it, it automatically
takes a % of that payment and transfers it to another wallet? This seems like a very useful function
that could be used for a variety of situations- e.g. profit sharing. Another application could be a one
to pay ten of my bills at once. I could have one eth wallet programmed each month to transfer eth
to the separate wallets of ten vendors.

If someone wants to program an ethereum application, where can they find programmers? Any
suggestions for books/videos on learning to program ethereum applications?

2) Scalability:
Will eth transactions become possible on a scale as wide as visa card transactions? How likely and
soon will this be to happen?

3) Security:
In a recent interview with Vitalik Buterin, he seemed to acknowledge security issues in the
ethereum network, but I didn't understand the tech behind what the issue was, so am not sure if he
was talking about a serious issue or not. How big are security concerns in the network, and are
these likely to be improved.

Thanks!