So, the multiple PAK support seems to be ok
Thank you very much everybody for testing

For me it works fine with more games Paks put in "share" folder...
I have two questions:
1) Is there a way to re-enable the compatibility with .spk Paks?
2) Is there the possibility to put the Paks files in the external SD-card?
PS: Thanks a lot for your work! 
1) The only way to enable spk support is compiling the code on the official server. For that we need to get our code changes accepted by the OpenBOR Team, after that they need to setup the GCW-Zero toolchain to work on their servers. We already did that in the past for Dingoo binaries

2) I don't have a SD-card, but if I remember well, each one is mounted with a different name, making difficult to set a fixed name on the code.
Sorry, but after further testing we found that you can put more than one game. But there are a few games there will be compatibility issues can not run. For example (Anking.q) produced(STREETS OF RAGE 6) flash back!
I'll take a look at Bare Knuckle VI, looks great

In theory, all games with 320x240 resolution should work. If you guys find any problem, please enable then post here the "Output Logs" content.