Pyrazolam definitely has potential for physical tolerance and withdrawal. I've heard a few reports of pyrazolam alone causing this (although such reports are quite rare since pyrazolam is often used by those who use other benzos). It definitely has affinity for a1, which is clearly palpable at higher doses, and can get quite sloppy and sedating.
There are some nonbenzodiazepines that are very selective for a2 over a1 (for those who are not aware, a1 affinity largely mediates sedation and habituation, whereas a2 is responsible for the anxiolysis). For instance, TPA-023, which is a negative allosteric modulator of a1 but positive allosteric modulator of a2 and a lesser extent a3. A compound like that may truly produce no major withdrawal syndrome.
Of course, I bet it is no fun. Then again neither is benzo withdrawal