Hi,
If you have DSOs as first layer after PSA in your BW system, you can just run full loads manually on chunk basis. All previous data will get overwritten in DSOs. Finally you have to drop all cubes data and run delta DTPs from DSOs by taking some down time from the users.
You can re-intialize your datasources and start running deltas. These can be included in the process chains.
3.Incase of missing deltas following your BWOM_TIMETEST, BWON_SETTINGS effects.
You cannot bring delta by manipulating these tables. These tables will give you the last delta time stamp details only.
REgards,
Suman