Not enough selectivity in realms (bedrock)

In creating normal minecraft bedrock worlds you obtain the feature to use experimental features such as caves and cliffs, gametest, custom biomes, etc. See, the problem here is that realms don't have this yet!

Me and my friends are currently importing a custom biome add-on/Mod that cannot be added due to this flaw.
A great reply would really get my head around this issue we have here and across our community that may occur aswell and be fixed.