No, there is no additional bump to NOV/TIR/PRO class cars. Not to sound condesending, but here's the whole picture. You have four classes:
NOV, TIR, PRO and Open. These classes are decided ONLY by where the driver wants to compete (in most cases). There is no PAX bump, etc.
The point of NOV is to give true novices a comfortable way into autocrossing without feeling completely overwhelmed. It also provides competition among newcomers and adds extra incentive (as if it was really needed) b/c of the competition. I won't touch the purpose of TIR or PRO b/c I don't wanna start down that road.
If you ONLY care about PAX results, then why be in NOV to begin with? You won't collect points towards the season standings anyways. If you are a novice and want to compare against other novices, you run NOV and play the game as it's played. In the end you can always do the math yourself with an ST* PAX and see how you would have placed that way.
At the end of the day, it doesn't make a big difference. You wan't to compete with PAX? Run TIR. YOu want to run in NOV? Go ahead, but don't worry about your PAX in NOV, b/c it won't matter in the season standings anyways.
I'm mostly rambling at this point and I hope some of it was helpful.
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1993 VW Corrado VR6 - DSP15 (RIP)
1986 MB 190E 2.3L 16v - STX (SOLD)
1997 BMW M3 3.2L - BS for now