Accel is the latest venture capital firm to consent to heightened regulation with the US Securities and Exchange Commission, a tradeoff that allows it to buy more shares of non-public companies that have been changing hands at steep discounts on private markets.The Palo Alto, California-based firm registered with the SEC as an investment adviser called Accel Management Co. The firm, which manages about $30 billion, will now be subject to increased disclosure and compliance requirements and regul...