Extracting detailed information on auditing

Hi guys,

My ECC system is based on SAP ERP 6.0 EHP6. I want to activate auditing such that I get detailed information on user transactions (t-codes) and values he has entered in these transactions. I've activated auditing using SM19 but it gives only t-codes run by the users. I can do an sql trace (ST05) which shows the values entered by user etc but I guess the trace cannot be run for too long.

1) Is it possible/advisable to run the ST05 for long period like SM19?

2) Is there some alternative to activating auditing thru SM19 that will give more details than the t-codes run by the user?

regards.