Some feedback from my group on our initial use of the die-roller(s) - for what it is worth. The consensus seems to be that they prefer the presentation of the dice on the default roller but the functionality of the Pro/API roller (particularly the Push feature). They like the way the dice are cleanly stacked in the core roller: Base Dice stacked next to Skill Dice which are stacked next to Gear Dice in separate columns according to die-type and color. The group found the way the dice were mixed/grouped together in the API roller, with the Gear dice often off to the side on the lower left hand corner (under the total summaries) to be a bit cluttered and confusing. In our group's opinion, if you stacked the dice on the API roller similarly to they way it is done on the Default roller, it would be a slightly cleaner presentation. Keep the dice neatly stacked and color coded in columns on the right side, separated from the summary/total's of success, banes and the Push feature on the left side.
Again, thank you sefnerr for this contribution to the community! Not sure this type of die mechanic would be easy to play on Roll20 without it.
Thanks for the feedback drsmitty. The API dice roller(only available to pro gm's and his/her players) was created and is maintained by someone else. I can only control the sheet and it's roll template. I wish roll20 sheets I had the additional API logic and functionality to group, tally, push, etc. the dice pool. Alas, roll20's sheet authors must work within a more restricted feature set. I definitely recognize the convenience of the API roller, hence the API dice toggle option "on-sheet", so that each person may choose their own roller.