Whilst the other main political parties are yet to publish a manifesto with a specific focus on the Islands, the Smith Commission (which is endorsed by the five main political parties) recommended further devolution to the Islands so the idea generally has cross-party support.
The dissatisfaction that island communities have with the powers currently afforded to them is that some policy areas fall outside the functions of local authorities, but have a major impact on island communities (such as ferry and air subsidies). However, it is unclear how these powers would be administered in practice, particularly in relation to island communities having control of Crown Estate revenue.
The Scotland Act 2016, which is only partially in force, states that the Treasury may "make a scheme" transferring all existing functions of the Crown Estate Commissioners to the Scottish Ministers; but does not clarify which powers are to be devolved. In addition, some functions may not be transferrable as the Scotland Act 2016 does not allow for transfer if a limited partnership holds an interest in the function to be transferred.
Further clarity is needed in terms of the Scotland Act 2016 before powers can be transferred to island communities. The Crown Estate also encompasses important areas such as fishing and renewable energy - with input from the UK Government required to put a grid connection to the islands in place - so it is likely that some areas will be carved out and control retained by the Scottish Government.
Furthermore, explanation will have to be given as to which powers are to be devolved from Holyrood to island local authorities, given the recent move to centralise public services, such as the police, fire services and the council tax freeze.
A potential stumbling block regarding devolution of Crown Estate assets is that, although localism and further devolved powers are generally seen as a good idea, there will always be tension between the Scottish Ministers and local authorities over control and how these new powers are exercised.