Rotor,
Flying SE in the "wrong" area of the H/V curve is as SASless says, an accepted risk. When conducting long-line operations, filming, certain types of surveys, you will spend the better part of an 8hr day in there. Obviously one tries to minimize the amount of time spent there, but when doing precision LL work, you my be sitting there for 10-15 minutes.
Engine failures do happen, but not very often, so I'm more concerned about making sure my wind is where I want it, the altitude I'm working at is acceptable for the work/machine I'm doing/using, and the risks associated with the job have been well thought out in advance. When you have a plan, think out possible issues, and prepare for them, you can work quite safely in many situations that are not "normal."
The stoves are good these days, so just try to control the small number of variable I can, and ficus on flying smoothly.
RH