I looked in the manual for the Foscam 8910 and it states if you enable "Disable Preset", this disables the ability to set or goto a Preset position with your camera. I believe you only need to unselect "Go Center on Boot".
This has become big topic on the foscam.us formus because these cameras seem to reboot a lot, which forces them into a patrol mode and then to a center position. I held off from buying a few of the Foscam's 8910W's because they seem to have stability issues when on wireless and reboot a lot. I have read a few postings on foscam.us forums that suggest you may need to do as RexxJ suggested. A lot of the manuals for these chinese cameras contain a lot of errors from cut and paste, so I would not be surprise if RexxJ is correct.
I purchased a Loftek Specter PTZ camera (640x480@15fps, 16 IR Leds, IR Cut Filter, 3.6mm lens) and have been very pleased with it for now. The wireless has been very stable, has true colors and it doesn't reboot on its own.
In general, I think a lot of the reboot issues can be reduced by plugging your Foscam 8910W camera into a good surge protector. If I didn't know better, I would swear that the Loftek and Foscam cameras are made by the same manufacturer, but just have slightly different firmwares loaded. I can specify what preset position number I want my camera to goto upon a reboot or select none. It still goes through a patrol mode, but then goes to Preset position I set.