Sorry to say but the assumption that because quake3 runs daggerfall will run through dosbox is wrong.
Quake3 is running natively on the cpu and is using the gpu, daggerfall is running through an emulator using only cpu. Even with the dynamic C recompiler for ARM it is still too slow for something like daggerfall or even the first elder scrolls.
Edit: sorry missed that there was 3 more pages of comments that clarified the inherit problems with dosbox and speed.
Nice to see the links back to the pandora and my port(recompile) of dosbox