A quick way to jump between the non-interest bearing stablecoin pools USDC/USDT/DAI/sUSD would improve the the basic functionality to bring the stablecoins to their peg, and probably get a lot of usage to Stabilize.
Similar to Zappers pool pipes, users would be able to jump from e.g. DAI pool to USDC pool with one transaction. This would enable users to easily take advantage of a sitiation where a stablecoin is above it`s peg of 1$ (with therefore low interest) and swap into a stablecoin which is at or below its peg (with therefore high interest), finally increasing the STBZ-yield and total amount of stablecoins for the user.
Stabilize itself would benefit since its usage and basic functionality to bring stablecoins closer to their peg would be improved: Users would more likely sell stabelcoins to the market when their peg is above 1$, thereby increasing the available supply of that stabelcoin and reduce the price.
The best sollution may be a smart contract integration of curve finance, which is the most popular low-slippage stablecoin dex. This has the advantage that only 0.04% fee is lost in the transaction between the pools; in comparison to Uniswap where due to the rooting from one stablecoin (via ETH) to another stablecoin the fee would be 0.6%.