Island world generation (Small/Average/Big)

Personally, I hate islands consisting out of 2-3 tile islands and then 3 or 4 of these islands in one territory. I wish there was a world gen setting to make islands:

-Small (only small islands as described above)

-Average (mix of small islands and big 1 territory islands)

-Big (only 1 territory islands, no more small islands)

This would be in line with rivers and lakes.