However, it is not now, because "correction in currency" doesn't really work.
What problems are you having with correction in currency? By default it's 0 which gives no effect. If you input number 1 in that field, the value that'll be displayed in the bottom field should be incremented by 1.
I want to use it for altcoin pairs, and coins that cost ~100 satoshi are displayed totally wrong, like 0.00001, whey I want to see 0.00000113 or 113s or something like that.
Strangely, coins below 100 are displayed correctly.
Here, ICX is stripped
This is intentional. By design, gadget has a very limited amount of digits it can display - only about 7 digits of precision can fit in the space available. If you're trying to display a number that has too many digits (like 1.2345678), it will be rounded. This is what you see when you say "stripped" - the last decimal is stripped (rounded, actually) because there simply isn't enough space to display it.
Another way the gadget copes with really big or really small numbers is by using metric symbols. You know, k for kilo (or 1000) and so on. On your screenshot, when it displays 240.000n for NPXS, n means nano; it means that NPXS exchange rate is 240 * 0.000000001 = 0.00000024. This is a way to get maximum precision (and avoid rounding) when you don't have high precision, but have many zeroes that don't fit. All more common metric symbols are listed here: https://en.wikipedia.org/wiki/Metric_prefix
Hope this helps.