Basically, no new position if spread > n.
For example, spread protection is part of 10points_3_smi_1.01.mq4 (EA) posted at
http://www.forex-tsd.com/martingale-average-cost-hedging/3473-10points-3-mq4-409.html#post409645 (inside zip file, EA folder).
Although the example uses a calculation, I think a fixed pip value would also be nice. Maybe in some future version of SB?
(WARNING: To any would-be 10points3 traders, the above link is provided as an example of a feature only. The EA will blow your account without running appropriate filters).
To anyoneone desiring spread protection right now, I coded the attached indi which should allow us to build TA conditions that handle the spread (and swaps too). Note that this indi measures the spread in points, and measures swaps per unit in the base currency of the account... I think.