Having the single Qsound rom will fix the missing Qsound issue for all games affected by it.
As to adding game roms and if there is an easier way to add more...be very careful what you ask, because the subject of downloading roms - which is copyright infringement - is something that won't be discussed around here (for what should be obvious reasons).
If you know how to use a search engine, you will find the answers easily enough.
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