That would be even better, if it's doable.
Ideally, we could combine both methods: have some fixed amounts (e.g. 1 SD, 10 SD, 100 SD, 1000 SD) and a box where you could enter an amount of your choice. This way those who need a quick overview don't have to type anything and those you need exact information have the option to get it.
Written down in the to do notes. Tho I will try to keep the site as clean and flashy as posable - too much info / numbers might be too distracting. Etherway I will do my best!