Sivir Rework Concept

Why Sivir should be reworked: Sivir is currently weak compared to more popular ADCs like Vayne and Caitlyn. She has a difficult time in lane when farming due to her rather short AA range. Sivir's kit is also not very flexible in teamfights or small fights.

Rework:

Passive: On the Hunt Basic attacks grants Sivir an additional 5 range and 5% attack speed. This effect stacks 5 times and lasts 4 seconds.

Q: Boomerang Blade Range is reduced to 800 from 1075 Sivir throws out her boomerang which deals 40/60/80/100/120 (+70% AD)(35% AP) to enemies hit. Enemies beyond the first take 60% damage. The boomerang than returns to her dealing the same amount of damage. Sivir is healed for 5% of the total damage dealt.

W: Ricochet Sivir's next basic attack deals 120% damage which then bounces to 3 nearby enemies dealing 60% of her AD. Sivir gains an additional 10 movement speed for each enemy champion hit. The movement speed bonus lasts 3 seconds.

E: Spell Shield Passive: Basic attacks restore 1/2/3/4/5 mana Active: Sivir gains a shield that absorbs up to 2 spells for 2 seconds. Sivir converts 10/15/20% of the blocked damage into a shield that lasts 2 seconds.

R: Adrenaline Range is increased to 1250 from 1000 Sivir grants all nearby allies and herself 10/15/20% movement speed and 100 range for 4 seconds.

What this rework changes: Better laning phase. Safer farm. More sustain. Less harass. More teamfight presence.

Please give me your thoughts on this. I also hope that someone from Riot considers this idea.