Buffs, skills and two grades

I have ep4.5 server.
1. How do I make visible buffs/debuffs for target mob or enemy?
2. Can I upgrade skills.sdata and dbo.skills for ep5 skills? Is it enough for ep4.5 server?
3. Can I make two grades for an one item or should I create the same item with different grade value?

1. impossible for ep 4.5 - just 5.3 full server file, not 5.3 private server file we have right now.
2. yes.
3. no, grade just have one colum in (ps_gamedefs) items.