It'd be handy if a turret subobject which uses $uvec and $fvec could also feature an extra property ("$normal_from_uvec"?) which would tell the game to use the uvec as the turret's normal (overriding any turret normal that might have been set in the turrets section). In most (all?) cases they're supposed to be exactly the same, and it's rather annoying to have to copypaste the uvec value from the properties box to the turret normal field and then change the commas to colons...once per every turret per every time you convert. Pretty much anything that allows you to do things in the modelling app before exporting, instead of having to do it in PCS2 every time you convert, is good.
Of course an alternative would be to have PCS2 simply check if the turret has an uvec set, and if yes, then use that as the default value for the turret normal, but the chances of anyone implementing new stuff into PCS2 and then releasing new versions seem much more slim.