(will answer here because it's more about HArchers than Alex)
MiniMe, you've absolutely wrong notion of extra hps as "fractional". These are exactly EXTRA hps, and are added together in autocalc (therefore numbers like 1,8 will mean some sort of "rhino archers" rather than "horse archers"). :D Note that elephants and chariots are classified as "cavalry" in EDU, so we can guess they use the same autocalc formulas (maybe even infantry uses the same). Dumb autocalc routine doesn't check if EDU entries are correct, it just applies them "as is" w/o question! So, we can pretend that extra hp for HArchers represents their ability to keep away from the enemy longer shooting extra volleys @ same time (tactical battles use completely different set of calc routines, so extra hps for plain cavalry are ignored there).
Dunno about serbian forum Maksimus mentioned, but i found it myself long time ago and tested in both vanilla and XGM and it definitely works.
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