Being a long time owner, I found a few ways to address the storage issues. Just like my fetish with flight bags, I had another one for storage. When I had my seats redone, I had a second pocket sewn in at the top of the seat back. Makes for handy storage of sunglasses, batteries and smaller items on top.
I also used a number of these on the side window to hold checklists, paper approach plates, IFR clearances, etc.: https://www.amazon.com/JZMYXA-Suction-Cup-Plastic-Suction-Advertising/dp/B075W8GD1R/ref=asc_df_B075W8GD1R/?tag=bingshoppinga-20&linkCode=df0&hvadid={creative}&hvpos={adposition}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl={devicemodel}&hvlocint=&hvlocphy=&hvtargid=pla-4583589101716915&psc=1
Amazon sells a whole slew of different style ones. This one came in handy for when my checklists were on spiral rings: https://www.amazon.com/Suction-Stainless-Bathroom-Kitchen-Windows/dp/B01J1UYI8O/ref=sr_1_26?hvadid=77653040847611&hvbmt=be&hvdev=c&hvqmt=e&keywords=suction+cup+clips&qid=1551824596&s=gateway&sr=8-26&tag=mh0b-20
I also tried this one out: https://www.sportys.com/pilotshop/portable-cargo-caddy.html
And this: https://www.sportys.com/pilotshop/pilot-pocket-pen.html
And I am sure a bunch of others stashed away in the hangar.