For what it's worth:

The other day I bought a new old stock (2012) WR250R for work.

The idle has been way too slow imo, and I also noticed awful backlash running it in through the hills in the on-off-on transition. This little machine is fuel injected like the Tenere - sort of. It has more efi gizmos like an EXUP valve, an airbox vacuum-operated flapper (which most owners seem to hate), coil-on-plug etc.

Finally, I fiddled with the idle speed until it felt right to me (probably a bit fast by most people's standards...).

Miraculously, the throttle transitions smoothed out to be almost as good as a nice carby engine. I rushed home and hit the Tenere with the same medicine ie cranked up the idle to about 16-1700 rpm, from about 1500 (on the tach, so is probably a bit of an estimate, but good enough).

My bike is much, much nicer to ride now, just with that relatively small increase. Happy.

Downsides: A very fast idle on cold startup ie about 2000rpm.
Some owners might find the elevated hot-idle annoying.