I know what I'm doing. =) Resources are the same in 32bit as in 64bit. I basically export PE64 resources to a PE32, open it with reshacker and then reimport the PE32 resources back to PE64. I don't use windows functions and I don't modify a single thing of the original resources (except fixing the addresses etc). As for speed, it's faster than adding a single resource to a file with the windows functions. The only thing reshacker can't handle are Vista's PNG icons. For that you can use my patcher if you need to. This system is error free and very stable. It's simple as idea, but not so simple to write, one has to have a good knowledge of win32 resources. Just to be clear, you don't need to use this system, my patcher already works with all the functions u need. I wrote this system for mainly other reasons. ResHacker is still very useful since it has a parser for resource files etc. I won't implement one, at least not in the near future, and it doesn't make any sense to reinvent the wheel. So, basically, by giving the user resource hacker for PE64s, I can focus on more important things right now. =) So, basically you can use this system for a painless and immediate transition, but you are not forced to. I hope this makes everything a little bit clearer.
