One of the problems Bitcoin presents over traditional currencies is the potential for unlimited divisibility. Currently I believe they can be divided down to 8 decimal places, but this could be extended with consensus from the network. Taxes are reported in Pounds/Pence or Dollars/Cents (if you’re in the US). Most accounting systems are geared up to handle these 2 decimal place currency denominations.
This doesn’t mean you can’t account for digital currencies like Bitcoin in QuickFile, it just means that for each transaction you’re recording the GBP equivalents with the BTC amount in the reference or notes. There’s a bit more detail on this here.
Although we have supported Bitcoin payment systems like BitPay for some time now, there are some significant hurdles to fully accommodate BTC denominated accounts and invoices. We are not likely to solve these issues in the near to mid term and given the work involved we would really need to see wider adoption and demand from other users.
It’s probably not the answer you were hoping for, but I hope it explains some of the technical challenges.