1) My first recommendation is: upgrade to 4.7! Besides that, BAPI or IDoc entry is the recommend best practice.
2) You need to code it yourself.
3) Again, you need properly to slice up your BAPI or IDoc function to add the missing functionality.
There is, of course, no need to use BDC/CTU to inject data in your system. SAP provides for most applications a direct update method via a BAPI, which is a standard and publicly released API to the SP R/3 transaction. However, BDC has some appeal if you have IDocs that deliver poor quality data and you often need to reprocess them. Having a screen popped up where the user can simply correct or complement the missing data, is a very convenient way of working.
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