Change SAPINST settings for SAP ERP on Oracle

Hi!

I successfully installed SAP ERP (Win X86, 64 Bit) with Oracle 10.2.0.4 via system copy.

So I installed the SAP system with SAPINST and with their typical recommended settings.

As result some tablespaces have up to 27 directories (SR3_01.. SR_27) and the maximum growth of all the tablespaces is 2GB.

Question:

1) Can I change this Tablespaces settings in order to have less ammount of tablespaces with tablespaces growth of 1o GB?

2) The autoextend of Tablespaces is "on". Should I change this?

3) What are other recommended settings for Oracle that should be changed after SAPINST?

Thank you very much!

regards

Jürgen