Engagement letters software

We use the ICAEW engagement letters. We’ve tailored these to the practice, but it still takes a huge amount of time to tailor each one for specific clients eg Sch B8 VAT – do we prepare or just review? Are there Intrastat/EC Sales? Is it monthly/quarterly/annual? What are the period ends? And there’s loads more – and that’s just the VAT schedule. For a client for whom we do payroll and tax credits as well as VAT and accounts and tax returns it can take up to an hour by the time we’ve gone through the lot. Ideally we’d like a piece of software where we can tick VAT – yes which opens a box asking monthly/quarterly etc, we select the appropriate and so on. So a few ticks and the odd date – then the software puts together the whole letter and all the relevant schedules.

Is there such a piece of software? If not, how does everyone else get round this time consuming activity?