While Plesk and cPanel are similar, Virtualmin and cPanel are not. First you need to understand that cPanel (like it or not) is industry standard and even i personally like more new Plesk 12 customers are used to cPanel.
Not sure if asking Virtualmin to be more like cPanel will do any good maybe if we finally get so long waited Virtualmin 2.0 then we could see where this control panel stands.
Frankly i would like to see Virtualmin to get “more like” Plesk (as i really hate cPanel) and i hope once the version 2.0 is out we can get close to that. Your ideas doesnt sound bad but i doubt it will make any change for Virtualmin. Regardless of numbers claimed by Virtualmin they are like grain of sand in the desert and if devs do not change their position nothing will change. Good for them as they will always make some money but not so good for Virtualmin users.
This is how i see things right now:
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popularity: cPanel --> Plesk ----> DA —(others like ISPConfig)—> Virtualmin
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industry standard: cPanel --> Plesk ------> Others
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security: Plesk <-> Virtualmin --> cPanel ------> Others
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what clients want: cPanel --> Plesk ------> Others
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what i like: Plesk --> Virtualmin --> cPanel ------> Others not taken into account
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offered options: Virtualmin <-> Plesk <-> cPanel (more or less all 3 are equal) ------> Others
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best free CP: Virtualmin --> ISPConfig --> Others. I didnt test Ajenti but looks promising and what i saw it could become (or it is) a really good control panel.
P.S. Only new Plesk 12 taken into consideration as previous versions were not so good.