Thank you for the suggestion. I will forward it to the team. You can take part in the future development of Wall of Sound through this Facebook group if you wish to: Torpedo: Wall of Sound v5 - Focus Group | Facebook
So, as i understand, the short answer is no W.o.S 4.3.12 is not able to load large I.R files for the moment.
Good luck for the future development of Wall of Sound.
We are with you.
Best regards.
For the moment Wall of Sound allows the use of longer IRs, but it truncates it to 20 ms (whatever their initial length). It does not use its full length.