I wouldn't think this was a particularly difficult thing to 'add' in to MYOB general ledger detail reports (or in the GST/Tax area etc) but we definitely DO need to be able to simply customise our MY...
MYOB already does this, just not in the General Ledger Detail Report that you have been using. Go to GST reports/GST -cash or accrual, put in the dates. The report shows each tax type FRE/GST/CAP/N-T and then the details of the sale or purchase value and separate colums for GST collected or paid.
You can easily run your eye down the list of transactions on the screen and see whether any transactions stand out as being wrong or requiring a further look. Click through to the transaction, check and change if necessary.