Transistor fingering reducing gate resistance
shouldn't the two transistor fingers be connected at the right side as well in order for the fingers to actually appear in parallel?

Aren't the two fingers already connected? I think they are.
All the gray area is conductive polysilicon and I see only one gray area in each transistor.
The only reason to also connect the right side of the gate in (b) is if you wanted a lower gate resistance. Then, like in (a) also add a metal connection to connect both sides.

the gate fingers are just dangling.

They're not really &quot;dangling&quot;, it is OK to make a layout like this (I have done that thousands of times) and they are connected at the contact on the far left of (b).
In my opinion, in (a) and (B) the gate resistance is similar. If you really want a low gate resistance then the gate must be connected on both sides using metal, like is done in (a).