PTE has no accel whatsoever by default.
In fact, if it was properly implemented it would wipe the floor compared to other methods of tracking.
Right now the biggest gripe with it is either Z-Axis tracking (earlier models, 4G by Razer might not exhibit this anymore or might have a very limited effect) and Dynamic DPI scaling, also a firmware by Razer, which changes the CPI on the smallest movements (theoretically it's a good trick so you get less sensitivity with small adjustments, but it feels like accel to some people.
Z-Axis is easily fixable (you only need to check how companies like A4Tech fixed liftoff issues by putting a button on the bottom of the mouse. Could be more stylish making mouse feet being on top of buttons), and Dynamic DPI scaling is a "firmware feature".
Maybe the only problem left is that you need the adequate surface for it to perform, but once you get it, it is quite awesome :
- PCS about 6m/s
- No accel
- No angle snapping
- High cursor quality
- "Low" liftoff
It's not perfect, but it's better than plenty of other offers... And no, it doesn't have accel (at least not the sensor itself).