Packages are a hard thing to do but lately we have discussed about $R even if the team isn't really interested, it seems we can add any data at the end of the ELF executables wich is great, this means we could implement some $R support all we need is a bit of knowlege about FPC's code so we can implement it, remember that we do not control the linker so this is a bit of a problem as we have to add data after linking, another way would be to use a dummy unit or inc file and define some constants there wich can later be used as resources. OSX on the other hand seems to support resources quite easy since OSX apps are really directories marked as apps.
Packages are quite complicated and Laz seems to recompile itself just fine so the FPC team is not interested in spending time on this