If I were required to bring my own tools (laptop, RedGate toolbelt, SQL Dev Edition, et al), then it would also be necessary for the employer to recognize that it's my darn laptop and they aren't allowed access to it. No keyloggers, no Symantec Performance Killer Enterprise Edition (that may not be the actual marketing name of the product, but it sure should be), etc. Monitor network activity on their network? Of course! Monitor server activity on their servers? Definitely! Ask my computer for a certificate or some such that says it's got appropriate security running? By all means. Install anything on it, scan the hard drive, check for software they don't like, even the browser history? No way.

Personally, I don't have anything to hide. But on the principle of the thing, I'd say, "You want to require me to bring my own computer and pay for my own tools, then you need to recognize that they're mine, not yours".

But I do think that would move the business closer to an agglomeration of individual contractors doing related work, instead of an employer-employee relationship.