Here is a draft of a comment letter that can be easily downloaded and modified to suit your needs.
The two additional suggestions are obvious modifications that Reg SHO should contain. Feel free to add your own additional thoughts.
As an FYI, NCANS is working on a draft of a comprehensive comment letter/proposal, and will be seeking to get signatures for it from any and all NCANS members, as well as the readers of this blog. Once the document is completed, I'll set up a fax system or some other mechanism for users to sign the letter, and then submit it to the SEC before the deadline.
That letter is quite detailed and technical in terms of the changes that need to be made. This one is a more general, short and to the point document.
Feel free to download it, change it as you see fit, and send it off.