Like Xero cash-coding, how can multiple lines be selected and assigned to a single account individually? 

If using Multi-Select and match, the transactions get tallied and combined. Why does it seem impossible to select multiple (unrelated) lines and simply apply the same account/tax criteria to them? Having it show up as a combined item is a bit useless as it stops the individual transactions being picked up easily in the mobile app and taking pictures of the receipts.

The alternative is painstaking duplication of mouse clicks line by line 

In Xero it's simple: Cash coding -> Checkbox the statement lines -> Dropdown the appropriate account. Then it's applied to all selected lines without combining them.