In MTW the speed of troops can be changed in the export_descr_unit file (somewhere near the end of the lines). I don't know wether this is the same for RTW/EB.
Iphikrates did not give spears to peltasts but lightened some equipment of hoplites and gave them longer spears (Diodoros and Nepos said so). One modern theory I have read argues that first he had marines for naval warfare in mind; during landing operations the new hoplites performed well, so were used on land too (sounds interesting but I'm not sure wether I'm convinced).
Iphikratic hoplites should be able to stand against normal hoplites because of the longer spears. I doubt a bit that they should be able to chase hoplites however; it was certainly not so easy to run with a spear of perhaps 3,5 metres lenght.
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