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I don't believe that simply knocking the wall down would be possible. Obviously I haven't seen it but unless the addition was built with the intention of having no wall there, removing that wall might compromise the structure. There are ways to reframe it, but I would recomend a professional design it because doing it wrong could destroy your garage.
As for the doors... If you don't need them it seems to me that your best bet would be to a)remove them and build a wall there or b)leave them (screw or nail them shut and caulk every seam) and build a wall immediately behind them. Do you have room to build two walls?
One other thought... you could add mass to the back of the exterior wood paneling before you insulate. I'm not sure what the best material for this application would be but I imagine that 5/8" drywall will work fine as long as it's dry. So ideally you would have (exterior to interior) wood paneling, 1or2 layers of drywall pushed against the paneling and held in place with 1x2s (caulk between the edge of the drywall and the studs/plates), then fluffy insulation, then a one inch gap, then a 2x4 wall with fluffy insulation, then 2 layers of 5/8" drywall. There should not be any mass (drywall) between the two layers of fluffy insulation. If you don't have room for the second wall you can look into resilient channel.
Sorry if you already knew this stuff.... Hope this helps.
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