For a mid travel setup, you can lift up to 3 inches in the front and 2 to 3 inches in the rear just like a non-kdss 4runner. Will require the same upgrades (aftermarket upper control arm) as a nonkdss 4runner. Any higher in the front, your CV angles may look out of wack.
The difference between non-kdss and kdss is the installation, which requires a few more steps and due to the leverage is a PITA if you working in your driveway.
Only time, kdss and non-kdss makes a difference is if you go long travel and that just means you will lose your KDSS system that you paid good money for as a option.
Recently, extended travel was also iffy, due to possible contact of the rear sway bar with the rear track bar, but thats no longer the case with kdss spacers. Also, not all vehicles are affected by this.
The KDSS lean also affects some people more than others. It can occur with or without a lift. Not all vehicles are affected by this.