Well, that's contrary to the instructions for filing out Form 8949 but I generally take the position that as long as you report your taxable income properly that doesn't give the IRS much leverage over you.
Personally I'd go the no "1099-B" route - why possibly confuse things with the IRS, especially if you DO have 1099-B-reported sales - and going that route takes only takes about 37.3 seconds more work.
