Imho, requests probably can be starts once core of amipdf will be changed on something modern and fast like that one which use vpdf on morphos (open source Poppler library and XPDF). As if didn't change amipdf core, it will be always slow as it now , and little fixes and visual updates will not help
Well beside the core changes having fixes will be always better than nothing even because for now this is the only program we can use for read PDF under AmigaOS .. yes i know that a Qt solution exists but it's not exactly a clean solution considering the general state of the framework (Qt is great but still not 100% integrated yet)
But don't worry, AmiPDF is now in good hands and i'm sure that step by step they will modernize it ... while we are talking they are still developing it
Meanwhile what prevents you to start porting VPDF under OS4 ?
I have a good news for you