I miss a command which gets me a value and also extends the TTL with one call. I think that could save a lot of requests in some use cases.

Example:

1 redis> GETEX nonexisting 100
(nil)

2 redis> SET mykey "Hello"
OK

3 redis> GETEX mykey 100

"Hello"

3 redis would also run this command: EXPIRE mykey 100

Is there a chance that you might add this command?