Build upon the powerful backend of dota2intel and use scripts written in the LUA programming language.
Track enemy ultimate cooldowns, their mana cost and roshan respawn time. Show hero items which may pose a threat (dust, gem, smoke, etc) to always be prepared.
Never attack too early and miss last hits. A visual marker is shown above creeps which will die if you attack them.
See if enemy heros have mana to cast skills.
See the location of runes which you have vision of on the minimap.