If the question is, "Does it need another gear?" then the answer is No, its perfectly fine the way it is.
If the question is, "Do i want another gear?" then that is your preference.
Out of all the bikes I've wrenched on, the ones with any sort of trans issue seemed to have 6 gears. Whereas the 5 gear trans, are seemingly indestructible.
Now a different tooth count pulley is another beast. Its not another gear at all. Just can reduce the amount of RPMs being turned.
2011 Vstar 950
-Cobra FI2000R (open loop)
-V & H slip on
-DIY Air box Mod (K&N Filter)
-Cobra sissy bar