Can Mana regen quicker in the fountain

I hate that if I leave lane because of 0 mana I have to sit around in fountain waiting for my mana to regen for a few seconds longer. Especially going up against energy champs. I would like the mana to regen a bit faster early game I already have to walk back to lane and since Energy and resourceless champs can run back to lane with no issues why can we not have quicker mana regen in fountain?
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