The last time I tried the dynamic download, it didn't work for us, because we use the PNGs for buttons and the dynamic download only works for the 'PICTURE' mnemonic.
Hiding the numerous PNGs shall also be achieved. I've built a DLL consisting of those PNGs with *plus/dll/maint, but couldn't make it work. As it is possible to use the old icons with setdev (0) set "RESOURCELIB" to "oldimages.dll", there should be a way, but I cannot figure it out.