Heating it up would be ok as long as the tank is not completely sealed during the temperature rise and you don't go crazy with the temp. Just like when you first fire up a hot water heater - you have to leave a hot water spigot cracked slightly to bleed pressure increase - you might want to allow for a small air leak during the tank heat up process to eliminate the temperature induced pressure build in a sealed vessel.
What is the CFM of the operated devices on the machine? Is it the main volume consumer from the compressor? My thought would be to warm the air for the machine only and leave the rest of the supply alone, but I don't know your set-up. If your compressor mainly serves the machine alone, then what you are talking about makes sense, I suppose. I think you might have a better chance by heating the supply line or building a heating section in the supply line. Without getting rediculous with cost, I am not sure how you could get enough heat in the air in the tank - seems like it might be easier to heat a few lengths of copper pipe (depending on volume) with self-regulating heat tape - or something like that.
This is an interesting dilemna....
Scott
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