Allocate stock to a sales order using filters

Opening the allocation form will attempt to allocate stock. It would be good if this was not automated (or an option to switch of the automated allocate) then allow the user to allocate using a filter such as the sales order line requested date or stock code. As an extension; it would also be great to have an option to unallocate stock using the filters. A filter to to unallocate items that are on-order in purchase order processing and/or are late in being booked in would be a bonus.