Customise the P&L
Customise the P&L so that we can have columns for each client, or vendors on a cash or accrual basis and with percentage of revenue for each major line items on the P&L, such as major lines of revenue, COGS, GP, G&A expenses, Personnel Expenses...
If you add the capability to have columns also be populated with "options" from the "tags" that we have set, that would win my vote.
I use a tag for "properties" and the options are the addresses of the properties: "1234 main street", "323 Cedar Street". This helps me see the P&L for each of my properties at a glance. Quickbooks does this using classes. Zoho is almost there. It just needs this reporting feature added.