Disclaimer: I am not responsible for any damage caused to you're keyboard if you attempt this, its merely a suggestion to be used at your own risk
Ok, with that out of the way I just wanted to share a quick tip thats been working for me regarding finding the shkval slew keys with my left hand. I originally just had a bit of tape on it, but after careful examination of my keyboard I noted that the 5 key on the numpad had a tactile ridge.
Reasoning that the numpad was mostly used for boring things like "math" and "work," I decided that 5 key would go much better in the shkval area, which is used for things like "fun" and "explosions." Anyway, the key popped right out with a little bit of persuasion from a pocket knife under it without any permanent damage and I just switched them over (sideways, since for some reason the locking mechanism for the numpad and keys are rotated 90 degrees on my keyboard).
If you have a keyboard you aren't afraid of damaging (such as the lovely example of a really dirty Logitech in the attached screens) and are comfortable trying it, it might be a worthwhile tip to try out. Please don't try this on an expensive board or with the hacksaw you found in the garage though, I really don't want to be responsible for you breaking your stuff.
Anyway, pair of screenies with a before/after so you can see what I'm talking about are attached.