First of all those numbers are not encoding.
They are PKI algorithms:
1.2.840.1135126.96.36.199 stands for SHA1withRSA and it is used for digital signature PKCS#7
1.2.840.1135188.8.131.52 stands for RSA and it is used for encryption in PKCS#1 format.
This means that Digital Signature cannot use 1.2.840.1135184.108.40.206. This does'nt make sense.
Because NDigitSign does Qualified Digital Signauture it uses 1.2.840.1135220.127.116.11
If you need RSA encryption instead of Digital Signature you need another software (that we have but we didn't published on this site).
In this case give me your requirements an we'll give you a estimation to customize our software for your needs.