On my first playthrough, I chose two skills almost as soon as I hit the Hitman capstone. From the outset, I wanted to piece together a viable kill skill build, with alternating action skill activations letting me trigger them on demand. This approach has worked pretty well so far, and I’ve had a blast running a barrier/clone build with a maxed Hitman tree, amongst various other options.
I genuinely do miss the utility of grenades, but the trade-off seems worthwhile overall.
Not sure how others feel about Zane’s grenade skills, but I’ve found most of them don’t really suit my playstyle at all. They’re too random, too inaccurate, or the chances are too low, for how I like to use them. Fully spec’ing into the Doubled Agent tree can make them a lot more viable, but it’s my least favourite of the three trees, and I seem to get far better value for the points elsewhere.
In general terms, I think it would be great to shoehorn in an option for Zane to manually throw grenades while maintaining two action skills.
Practically however, I’d much rather see the same button(s) allocated to provide better utility to his existing action skills instead; not unlike how holding the AS button activates Dopplebanger (for example).
Currently, Zane’s action skill animations and execution are functional, but incredibly clunky for a fast paced playstyle. Held button features used to say, automatically collect/drop the shield, or offer added clone utility, could really improve his gameplay IMHO.
Edit: fixed some wonky sentences and typos. 
