To expand on what Kreatyve said, D&D has never had a "roll-your-own character class" type system (not including 2.5, I NEVER include 2.5!!). While that has it's own merits, D&D doesn't really play there, so the chances of something like that in Neverwinter are slim and none. The closest we have is multiclassing, and NW has even avoided that completely.
That said, the Bard is historically the closest to a "multiclass in one class". An idea I thought would be cool is to have a Bard that could pick any other class's Paragon Path, to emulate multiclassing. Spell Storm Bard, here I come!!!
I can't see it going to the extreme of 'build-your-own' (too ripe for exploitation / broken builds), but the Lore Bard gets to pick a spell from any other class at certain points. So, to emulate this (if it was possible), IMO, would be to let the player choose one at-will (the third), an encounter (something around level 45), and maybe the last daily from a selected list - one selected from each class. So, you could have a bard with astral seal and sudden storm... Or magic missle and divine glow....
Lore-wise spoken, I don't see it. A Cleric is a divine conduit, power granted by his god. A Wizard uses the power of the arcane magic. A Druid draws on the divine essence of nature itself. There is nothing that these classes have in common except that their ability is called "spell casting". I do not believe that any god would grant the follower of another god (nature god) the power to cast one of "his" divine spells. And mastering both, the divine essence of nature and the arcane to cast spells from both domains seems a bit outerworldly, godlike to me. Too much power for a mortal.
You'll have to take that up with Wizards of the Coast and 5th Edition. Bards have a feature called "Magical Secrets" (all Bards get it actually, Lore Bards just get more) that allows them to occasionally poach spells from any other class, even Paladin-specific spells. Their regular spell list really blurs the lines already, overlapping spells from Clerics, Druids, and Wizards. My own 8th level Lore Bard Rowan has taken Spirit Guardians (Cleric) and Counterspell (Wizard). At 10th, one of the spells I plan on snagging is Destructive Wave from the Paladin, a spell they don't even get until 17th level.
As for godlike? Rowan would like to think so! (He's wrong of course, but a Bard can dream...)
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As for godlike? Rowan would like to think so!
(He's wrong of course, but a Bard can dream...)