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To obtain СА, only 4 skills are required for any race. It is undesirable to take a fifth unless absolutely necessary, as abilities from it will also be offered during level-ups. This will delay obtaining СА. Naturally, it is preferable to choose a hero with the skills necessary for СА.
On Hugolka there is a mod for version 2.1 that allows you to see the skill wheel during level-up without (Alt+Tab). It works in 1.5 for me as well.
2) Some heroes often already have a "fifth skill," and those who don't have "extra skills" are often forced to take one before taking the ultimate ability.
3) It is recommended to use mods only for personal convenience; they are forbidden in Tournaments or online play, and they only create network connection problems.