Any way to load setup tables and do initilization without blocking postings

Are there any ways to load setup tables and do initialization without blocking postings in Logistics/non-logistics applications?

When do exactly delta-setup in ECC or R/3 (i.e. delta queries, extraction queries, update jobs) created? At the start of initialization or at the successful completion of initialization run?

How to capture changed/new data while doing initialization run in LO?

I was thinking an untested solution based on SAP notes 398406 (for FI_AR_03, AP_03) for this, like, doing initialization with far future dates, for example year 9999, then doing initialization with real selections, that way I guess we can capture new/changed data in delta queues/extractor queues/change tables. Does this solution works for LO extractors, as it works for FI_AR_03 and FI_AP_03?

Thanks

Mani