@Kaiser:
I agree that in spite of the best intentions island hopping warfare so prevalent in the Pacific doesn’t seem to organically be built into the rules. Have mulled about making houserules to adjust this for quite awhile.
Simply put, making all non-Japanese islands not worth any IPC become worth 2 IPC for Japan provides a pretty nice incentive to go after places like the Solomon islands or Guam. It also creates an incentive for the Allies to protect them with units.
I particularly like all SZ’s with an island provide the extra space movement for both aircraft and ships (to simulate leaving fully supplied from port) instead of requiring Naval Bases be present.
I’ve also toyed around with the idea that aircraft on any island have an opportunity to “intercept” hostile ships moving through that SZ via localized air patrols. Single round of combat with sub-like capabilities on the fleet for being spotted. Have to roll a 2 or less to make it happen and then roll the attack value per aircraft to strike a hit.