If you're talking about accrual budgeting in contrast to accrual accounting, then I would raise a number of cautionary flags.
Financial reporting in Canada, I believe, as in most of the developed countries, is done on a modified accrual basis already. If you move the budget to an accrual basis, you have to be very careful about how you do it. Australia did it wrong, with disastrous results. The budget gets to be more complex. There's a lot more misunderstanding about it, particularly with respect to depreciation accounts. To tell you the truth, there are only about half a dozen countries that really have what we'd call an accrual budgeting system. The fact that so few countries have it would indicate that it's not something I would put on the top of the list in terms of urgency.