It would be cool to organize the shopmenu into layers like the buy weapons menu of CS

You could simply number them in the coding 

Category  "One Time Use" could include items like tome of XP or Tome of Health or things that you use once
Category "Power Ups" or "Attacks" might include orb of frost, claws of attack, Fire charm etc
Category "Enhancements" might include ring regen longjump etc

This would make things much more organized as shopmenus grow I want to have 4 or 5 categories so it should be customizable...
Allow us to eitherj sut add item to category or define new category..

I would add for everyone items restriction depending on level of the player. For example some subjects that could be bought, when level of race 10 or 11 or 16.

Whether it will be realized?

its someone made it, i would he happy to package it, given its up to my standards