The shifting quality as per say won't really improve; however common upgrades are steel 3/4 shift fork (factory is alum and bends over time), billet keys (factory are stamped metal), and bronze fork pads (factory are plastic and can deform).
These bring the power rating up to 600rwtq. We have run one in this Stage2 config with 1000rwhp+ and no issues. It was a 3000lb car with driver and never launched hard (9.20@162mph best).
The new style blocker rings are also carbon lined vs the older style which are not. Unless your synchros are worn out these upgrades won't make it shift better. The GTO style triple synchro trans shifts better... And the T56 magnum (tr6060) is the best.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
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