The British "Castle" class corvettes escort ships would be a good ship to add into the game. It would be a PT boat on steroids, with more armor, more firepower (minus the torps), and less speed. IIRC, a few of the USN Castle class corvettes had single 5in gun turret up typical of a destroyer.
**from wikipedia**
"Castle Class Corvette"
Displacement: 1,060 long tons (1,077 t)
Length: 252 ft (77 m)
Beam: 37 ft (11 m)
Draught: 10 ft (3.0 m)
Installed power: 2,750 hp (2.05 MW)
Propulsion: 2 × water-tube boilers
1 × 4-cylinder triple-expansion steam engine
Single screw
Speed: 16.5 knots (30.6 km/h; 19.0 mph)
Range: 9,500 nmi (17,600 km) at 10 kn (19 km/h; 12 mph)
Complement: 112
Sensors and
processing systems: • Type 272 radar
• Type 144Q sonar
• Type 147B sonar
Armament: • 1 × 4-inch Quick Firing Mk.XIX High Angle/Low Angle combined air/surface gun
• 1 × Squid anti-submarine mortar
• 1 × depth charge rail, 15 depth charges
• 2 × 20 mm twin anti-aircraft cannon
• 6 × 20 mm single anti-aircraft cannon
Or... if the Castle class corvette seems too powerful for personal use, then perhaps the lessor Flower class corvette:
**from wikipedi"a**
"Flower Class Corvette" (modified/upgraded)
Displacement: 1,015 long tons (1,031 t; 1,137 ST)
Length: 208 feet (63.40 m)o/a
Beam: 33 feet (10.06 m)
Draught: 11 feet (3.35 m)
Propulsion:
* single shaft
* 2 × water tube boilers
* 1 × 4-cycle triple-expansion reciprocating steam engine
* 2,750 ihp (2,050 kW)
Speed: 16 knots (29.6 km/h)
Range: 3,500 nautical miles (6,482 km) at 12 knots (22.2 km/h)
Complement: 90
Sensors and
processing systems:
* 1 × Type 271 SW2C radar
* 1 × Type 144 sonar
Armament:
* 1 × 4 inch BL Mk.IX single gun
* 1 × 2 Pdr. Mk.VIII single "pom-pom" AA gun
* 2 × 20 mm Oerlikon single
* 1 × Hedgehog A/S mortar
* 4 × Mk.II depth charge throwers
* 2 depth charge rails with 70 depth charges
They would be a fun addition to the game, but I'm not sure how they would be implemented.