Currently the software does not have a feature for per-client API rate
limit adjustments, so I'd have to make that first. Currently I'm quite
busy with improvements to the iOS app, and that development effort will
serve a larger (paying) user base, so it has higher priority than this.
Note that you can fetch multiple targets with a single call (subtitle
"Querying multiple targets using a single request" at
https://aprs.fi/page/api), and the rate limit is for the number of calls,
not for the number of targets fetched.
If you'll need data on a more consistent basis, you should probably
connect directly to APRS-IS, parse the data stream and insert it into a
database of your own.
- Hessu