I know there is a weight painter in the modelling pallate that allows you to paint and inspect frame by frame.... I usually then imported everything into fragmotion to double check... to be honest I only used this for importing models into realmcrafter.. but It worked fine there.. I can experiment later with getting it into gamestudio later.

the thing about scaling in carrara is on export it will give you the option to convert the scaling to poser, hex and yadda.. at least i noticed that with the object formaat and you need to check either no scaling or something.