I don't really see the point of that considering that the NR does have a large list of almost useless frigates (which ships depends on fleet tactics). Depending on ship to ship firepower VS fighters VS shielding. Though last I checked the Dreadnaught was in large supply for the NR...
In addition I apologize for any past rudeness sometimes I get agitated and lash out passive aggressively on forums.
Thirdly I was reading up on Thrawn for an idea for a new mechanic in Ascendancy (Dummy Trading Ships) and noticed that Thrawn considered the Chimera outgunned by four Assault Frigates. While I can't calculate the DPS myself due to a lack of ability to read the mod's code, I can compare the raw number of guns.
So the question is of course then, should a group of double the pop cap of Assault Frigates be able to outgun an ISD2 with leader bonuses? As a side note, I guess Thrawn was really scared of those Proton Torpedoes. As an additional side note, according to Wookiepedia Assault Frigates carried these things on them. http://starwars.wikia.com/wiki/Gamma-class_assault_shuttle If the Assault Frigate really does need a buff, how about boarding parties eh? If that's in the base game. As a third side note, despite the umbilical docking cords not working in hyperspace Assault Frigates in 2.1 did carry X-Wings which can hyperspace on their own.
The point is variety and lore reasons that have already been described, detailing the crew requirements of the Assault Frigate compared to the standard Dreadnaught.
To answer your question...
From a balance perspective, no, a capital ship like an ISD is supposed to excel at fighting other ships(unless we're getting into even larger numbers of assault frigates). That and the fact that the assault frigate is *drumroll*-
-bad.
In game depending on if the Chimera was player controlled it would go something like this: Chimera focuses on one AF until shields drop and takes down turbolaser hardpoints and repeats with the 3 other ships until no threat remains. From a lore perspective, it would probably still have to hyperspace out because it's fighter complement would have been destroyed completely by that time, but not until destroying the Assault Frigates. From a gameplay perspective, it would win because the game doesn't count 'carried' starfighters as having units on the playing field(at least for TIE Fighters and such it doesn't).