I still dont understand the mentality behind buying a $1000+ bass and then talking about or encouraging folks to begin modding it.
...This is why I hate TB sometimes. It becomes one mans perceived issue and then its a problem across the board.
What are the issues/complaints?
I realize that it seems a little bizarre, but think you're reading too much into those posts. This is probably the most complaint-free group on TB.
IMO, the biggest problem with modding Dingwalls, is in finding something to do. Sheldon sets the bar so high in terms of thoughtful design and neatness of execution, that it's difficult to find meaningful improvements. It's also hard to install them with anything approaching the same quality level as OEM.
Still, on the Dingwall site as well as here, Sheldon actively supports careful customization of his instruments, both in the order process for a new bass, and in fine-tuning the finished product. I have seen his team bend over backwards to source out-of-production materials in order to offer specific pickguard colours, etc.
He also seems to keep an eye on successful modding projects, and incorporate user input into new models like the ABXXX.
CNC manufacture allows him to offer DIY projects that fit like a glove. Fretless wenge neck, anyone?
Perhaps that is what gives him the confidence to freely offer advice and schematics for things like parallel-to-series pickup wiring changes, parts for SJ-to-SPJ conversion, and developments like his $10 pickup mod for early Combustions.
Speaking of which, the bulk of the modding action seems to happen with the Combustion. Yes, it's a $1,000+ bass, but it's the bottom rung of a ladder that extends into the thou$and$.
The basic carcass has many of the engineering advantages of the more expensive models, and as such, it's both a logical entry point into the family, and an affordable platform for experimentation. Sheldon even offers his own "mod kits" in the form of pickup upgrades.
Also, Sheldon wisely chose the EMG BTC as the preamp for the Combustion. It's affordable, and hi-fi enough to not mask the essential goodness of the rest of the instrument.
Still, it's relatively neutral. This leaves the door wide open for people to install a Glock for surgical purity and glassy highs, or any number of other specific flavours.
When there are options, people will opt for them. It's cool that there are so many custom/aftermarket components available for us to play with now. When the Combustion was just coming out, Sheldon pointed out that certain Nordstrand pickups would drop right in. He realizes that 'one size does not fit all'. My Super P is getting modded right off the bat. One option that Dingwall does not offer is a black abalone pickguard which happens to be one of my favorites with sonic blue. 
