tip event + other

Events
You can add old event as game mode. Some events is good, some not, but i can play character in there mode. In normal too is easy. (Lol game change rotate event, too good)

Skill gem
I still not understand without wiki, which gems i can combine. Can you add to game some easy table? I select skill, show me all support gems.
Typical: I have Hartred ice. i can combine with +20% elem. dmg. Ok, this work. But my Ice shoot skill not add dmg. My Siege balista not add dmg. But aura show me add dmg. Around totem is hartred ice aura.
I have On hit gem. This is what? Enemy hit me? Or I hit Enemy? Its suported by spell. I combine it with frost waves, but not see any one. Work in on toem? If i try passive skill +1 add totem and not do dmg, still hit work? (I now trying do super totem Siege balista. Fast attack, cold dmg, Bow 3.0 att speed / 0.2, Balista 0.3; Its googd, single projectile 6000 dmg, auto targeting)

City on map
Can you show city on map bigger? Double. I sometime can go to city, but click on some portal near city.

Trade / gift center
I sometime drop unique. I not need it. I can give (no cost) it to some player around lvl +-10 of item lvl-need. But, i not give time for search or waiting on it. Yes, i can sell it, but sometime is good item.
You can add to board as new tab for trade, for sell. You can limite stack to one of item (or more, but limit to wintrap to one). If there is one, player not give. Must use his bank or sell.
Yes, somebody can create +- 20lvl character only for robe items from give center. Is not problem, if there can.

Bosses
I have still problem with bigger monster. Maps lvl 75. Last bosses (piety, malachai, labyrint) in merciles. I dont know, how somebody live on hard mode. I have for example 7.000 hp, 75% max resit, 10.000 armor, but boss need one hit (dmg or spell), i die. Yes, may be some flask for unverbality.
But better for low dificult. Sometime i not die.
Game have now strategy, do lot of hp or energy shield or reflex(dexterity). Not other skills is not usable. Or you must later change tree for this combination. Or, you cant play on hard-core :)

Items
My Friends go out from Poe, because, if drop unique, drop low-level item. Example, i have lvl 50, drop me item for lvl 5. if drop for 40, may be not problem. I now use 3.0 att speed bow from low lvl (may be 15?) on my lvl 65, but have 3.0 att speed, good for Siege balista. May be, i change it, because on lvl 65 is not too good :) But have about 6000 dmg. With cold uniq bow heve 10.000 :)