Automating the Hiring (Mass upload)

Hi,

In one my project since user feel hiring through PA40 is time consuming, we have planned for a automated hiring through custom webdynpro application

As for as now, we were planning to upload a flat file using BAPI & FM (HR_MAINTAIN_MASTERDATA, HR_INFOTYPE_OPERATION) combination.

Now I have few doubts on how to go with the same plan

1. HR_MAINTAIN_MASTERDATA is used to hire employee, is it possible to create all infotypes apart from IT000, IT0001 & IT0002 at one shot?

2. If many different user group available and the setting is done in SU3, how to handle that in Technical side?

Regards

Raj