Companies like DRW use proprietary methods to trade a variety of instruments, incuding equities, using their own money.
Is anyone here familiar with these methods and can they be used by individual daytraders?
The simple answer is no. As I have indicated before, during my days in chicago, I am fortunate enough to be somewhat familiar with a few trading firms, incluing DRW. While I can't claim that I am very familiar with their methods, their strategy category is quant based market making. To do market making, the basic requirement is a good quantitative understanding, and things like decent capital size and exchange memberships, etc. While the requirements are not completely out of reach for a "day trader" (i.e., 1M or so in capital and an exchange seat), I am not sure that's what most daytraders willing to do.
However, firms like DRW deploy a variety of methods, some of the "borderline" methods (for instance, dividend strategy between SSF and the security) can be tailored for the daytrading class of trader. But since I am not a daytrader, that's not really my area of speciality nor interest.
Hope this helps.