A:AnswerYes, it does have two XLR inputs. They are in the detachable handle. There are volume wheels and mic/line level selectors for each XLR input, also on the handle.
A:AnswerVideo is stored to a SD card. The camcorder can support two SD cards at one time. When the cards are full you can save the cards for future use. If you want to transfer the video from the cards to your PC, you can do that. You can reuse the cards as much as needed. Not sure about plugging it into PC and recording to PC direct through camera. Never tried it.
A:AnswerYes it doe's it's a wired remote that plugins in to the side of the camera. IT has a record button as well zoom and wide angle buttons. It works good I haven't tried it with an extension cable yet but I would think it should work. Wired LANC Remote Control for Canon XA15 XA11 XA20 XA25 XA30 XA35 XA10 XF... Best Buy didn't have it so you may have to get it elsewhere.