It is vital that each tenant knows their payment schedules. We deal with shared student houses, and each tenant will have their own schedule - either monthly or when their loans come in.

We currently use a cobbled together form that creates a custom standing order form for each tenant, that captures their own payment schedule. This creates duplication of data entry and the obvious problem of having this information in two places.

The easy fix would be to have a tag available that would show in documents relating to tenancies (so it can either be in a custom document, or in the AST) that allows pulling through the rent payment schedule for each tenant.
This would also need the generation of the tenancy agreement away from an individual tenant (eg from the actions button under tenancy). This is non obvious location anyway - we deal with joint tenancies so the tenancy generation should really be in a central location, ideally from the actions button for the tenancy.