Where is the point? OS can't know which emulation are needed for that
particular game (if it needs emulation at all) and emulating AGA is
not trivial job. You can't use custom chip emulation from UAE just
like that.
For example some games may poke to low mem which is illegal. Another
game may try stealing WB bitplanes (fails in CGX/P96). When some other
game may expect certain timings i.e. it expects 68000 @ 7MHz and PAL
frequencies. Way too many problems without advantages.
UAE does it better. Use it.
