Would there be any risks involved by turning up the power output of the wireless?
I can see these possible risks:
1. Heat. Even at power level 10 I cannot feel any heat coming out of the box in either orientation.
2. Power. It is possible that high power settings might exceed the maximum power allowed for unlicensed transmitters on the 2.4Ghz band. The link says that in the UK the max is 100mW. I do not know what it is in Canada or the US, however the device has been approved by the FCC so it is legal in at least the US.
3. Radiation. Just as there is concern that cellphones and microwave ovens may radiate microwaves at harmful levels I suppose it is also possible of WiFi routers. But again it is supposedly FCC-approved.
This setting is a fully documented feature in the User Guide. There are no warnings about excessive heat, power or radiation concerns. I hope that is because it is not an issue rather than an inadvertent or intentional omission