on the inner tube strips thing, yeah, that won't provide any sort of dampening effects, so it's no big deal.

BUT, depending on the quality of your paint, it might not do anything to save it. i've had things mounted like that before, and when i've taken them off, it peels a nice strip of paint off with it. especially gas tank mounts. gas saturates innertubes, and then goes to work on the paint. i figure, the motor, chain, all the cables and zipties, etc. involved with these things is gonna scratch up my bike anyway, so i just don't worry about it.

on another note, i think gas tanks SHOULD be mounted using some kind of rubber, like wrapping your frame with innertube, or using skateboard bushings or something on the bolts.

isolating the gas tank from a vibrating frame cuts down on fuel-foaming.

plus, the studs in the stock tanks are so cheap, if they're too tight, over time they can crack the shoddy spotwelds that hold them in, and then you have shoes full of fuel.