That's your view - unfortunately, the only view that really counts is MAs view... and i'm sure they will see it as cheating when they catch you using such a keyboard to i.e. skill afk. And FWIW: So do i.
Where did he mentioned he wished to skill while AFK?
Look, long story short - ANY TOOL can be misappropriated and used in violation of (some peoples...) views on ethical gameplay.
A far more realistic example than the dildo example:
Car is a tool, driven place to place. Very useful.
Can also kill many people, has that potential - happens regularly. Idiots tend to try to blame the car, instead of the driver, for deaths that happen while cars are being driven (very very VERY few cases otherwise).
A repeat function/auto clicker (and I know this for a FACT) has saved quite a few people from RSI - even helped one person I knew get over the injury, and continue playing EU while both wrists were in braces, and the fingers locked, too. Flip side is yes, it can be used to auto-click while AFK. But ya know what? I see no "honor" in sitting for 6 hours drilling (clicking every ~3 seconds) out an 1800 ped oil, or sitting clicking every ~5 seconds for doing a crafting skill run of 10k plastic springs (~14 hours at maximum click per minute/hour, btw), especially (one perfect example I know of) when you just hit a 3k lyst at 5pm, and you have a hot date @ 6:30, and aren't expecting to get home til well past midnight. It's gonna take 8+ hours anyway to drill up, so it's not like you are "free skilling" (they are skills you were going to get, anyway! At no difference in cost!), it's just enabling you to do something constructive/useful with the time, other than be a bored lump on a log.
If you can think of a LOGICAL (and please consider that word
carefully) reason for that, then I'm all ears. Otherwise, it's been developed (or rather, not improved upon) as a massive timesink with a greatly increased chance of physical injury in the long run (RSI).
As for a tool that is good, I agree with Nicole - the Nostro is probably the best one you can get (don't have one, but also don't need it, lol).