Actually, I regularly use lubed pellets in my springers. I use them, too, in my single-shot PCP's - the TalonSS, and when I use the single pellet tray in the Rapid. But basically, ALL the springers (R9, TX200, Theoben Evolution).
The thing I do NOT use lubed pellets in is the PCP's with a magazine. It is the magazine that is the problem - I don't own springer with a magazine like the SLR98, but if I did, I would avoid lubed pellets there, too. Magazines tend to pick up the lubricant, then attract dust and dirt, and eventually show you problems. Some magazines are easier to clean than others.
I have tried several different products and mixtures of stuff for lubes, and have settled on the "Slick-50 1Lube" in the spray can. You get 12 ounces for less than the price of a 0.42 ounce bottle of Napier. I dump 250 pellets in a baggy after I have spayed the inside with 2 or 3 small sprays of 1Lube, then shake and rub the lube on the pellets, pore them out on a paper towel, and let dry for a half hour. It dries with no film to get on your fingers or barrel, and most important, it actually seems to make some difference.
To test this, I lubed at least 15 different pellets with both Napier and Slick-50 1 lube, and then chronied the unlubed and lubed pellets. It was rare to see any difference with the Napier when compared to the unlubed pellets in either fps or velocity spread. But the 1Lube pellets usually had 30-40 fps more velocity, sometimes more, and the spread reported by the Chrony was much less. I know that velocity is not the most important parameter, but it is one thing where you can demonstrate an objective difference.
It's hard to talk about accuracy, simply because it is so dependent on the gun, the shooter, the wind and weather, and who knows what else. If you are going to make accuracy claims, then PROVE IT.
Since I usually swab the barrels in all my guns with a lightly oiled patch (followed by dry patches until pretty dry) about once every 2 weeks, I rarely ever clean the barrels with barrel cleaning solution (unless the gun is new). My barrels collect only a little lead dust in that time - I think this is mostly from the CP's I often shoot. CP's tend to be very dirty - they are the one pellet I always clean with detergent when I get a new box, but even after cleaning they tend to soil your fingers. Maybe lubing helps with a clean barrel - I'm just not sure because I keep them wiped out anyway.
Some pro shooters I know lube their pellets, some never do. It's up to you, but I think it would be very hard to hurt your gun with a lubed pellet. It would have to be dripping with oil to cause any dieseling. Lubing is supposed to be done very lightly. I've never had a gun diesel when I used lubrication.
Besides, some detonation of the oils is absolutely necessary to get good performance from your gun - but that's a whole nother discussion...