Yep we are putting our best efforts and love into this project , next version (closed Beta) will bring better controls + tuning and at a later date the final rom will be released for free
Concerning bank switching it just works as shown with this Alpha (proof of concept) ;-)
For your own projects you just need several makefiles where you put your data (tables/obj) in.
NgDataLinker will take care of the addresses , everything is explained on the git Readme ;-)
For testing out, i recommend to use Mame as there are compatibilities issues with P roms layout using NeoSD and NeoBuilderUI_1.06 which is expecting *only* two roms P1 (1MB) and P2 (1 to 8MB) .
To get the proper layout and build up P2 from several files u can use the new version of RomWak 0.3f as i've added to it a new concatenate option /c
https://github.com/freem/romwak/
Have fun